I have a new Boron device that connected immediately, and after a bit of work and testing stopped entirely. I tried working through the troubleshooting (which is in no way simple, by the way), and nothing worked.
Cloud debug log:
0000015369 [app] INFO: Starting Tests!
0000015369 [app] INFO: Platform: Boron
0000015369 [app] INFO: Binary compiled for: 1.5.2 0000015370 [app] INFO: Cloud Debug Release 1.5.3
0000015370 [app] INFO: System version: 2.0.1
0000015371 [app] INFO: Device ID: e00fce68074bdf4351c284c8
0000015371 [app] INFO: Power source: VIN
0000015372 [app] INFO: Battery state: disconnected, SoC: -1.00
0000015372 [app] INFO: This device could have Ethernet (is 3rd generation)
0000015373 [app] INFO: FEATURE_ETHERNET_DETECTION not enabled, so Ethernet will not be used (even i
0000023381 [app] INFO: deviceID: e00fce68074bdf4351c284c8
0000023382 [app] INFO: PMIC inputVoltageLimit: 3880 mV
0000023383 [app] INFO: PMIC inputCurrentLimit: 900 mA
0000023384 [app] INFO: PMIC minimumSystemVoltage: 3500 mV
0000023385 [app] INFO: PMIC chargeCurrentValue: 896 mA
0000023386 [app] INFO: PMIC chargeVoltageValue: 4112 mV
0000023386 [app] INFO: modem is not yet responding
0000023389 [system.nm] INFO: State changed: DISABLED -> IFACE_DOWN
0000023389 [system.nm] INFO: State changed: IFACE_DOWN -> IFACE_REQUEST_UP
0000023391 [net.pppncp] TRACE: PPP netif event from queue: 1
0000023391 [ncp.client] TRACE: Modem already on
0000023392 [ncp.client] TRACE: Setting UART voltage translator state 1
0000023393 [system.nm] INFO: State changed: IFACE_REQUEST_UP -> IFACE_UP
0000023402 [app] INFO: Still trying to connect to cellular 00:00
0000023402 [app] INFO: Power source: VIN
0000023402 [app] INFO: Battery state: disconnected, SoC: -1.00
0000023492 [ncp.client] TRACE: Setting UART voltage translator state 0
0000023592 [ncp.client] TRACE: Setting UART voltage translator state 1
0000023592 [ncp.client] TRACE: Muxer is not currently running
0000023593 [ncp.client] TRACE: Initialized muxer @ 460800 baudrate
0000023593 [gsm0710muxer] INFO: Starting GSM07.10 muxer
0000023594 [gsm0710muxer] INFO: GSM07.10 muxer thread started
0000023894 [gsm0710muxer] INFO: Stopping GSM07.10 muxer
0000023894 [gsm0710muxer] INFO: Gracefully stopping GSM07.10 muxer
0000023894 [gsm0710muxer] INFO: Closing all muxed channels
0000023895 [gsm0710muxer] INFO: Muxed channel 1 already closed
0000023895 [gsm0710muxer] INFO: Muxed channel 2 already closed
0000023895 [gsm0710muxer] INFO: Muxed channel 3 already closed
0000023896 [gsm0710muxer] INFO: Muxed channel 4 already closed
0000024546 [gsm0710muxer] INFO: Sending CLD (multiplexer close down)
0000025446 [gsm0710muxer] INFO: Received response to CLD or timed out, exiting multiplexed mode
0000025496 [gsm0710muxer] INFO: GSM07.10 muxer thread exiting
0000025496 [gsm0710muxer] INFO: GSM07.10 muxer stopped
0000025497 [ncp.client] TRACE: Initialized muxer @ 115200 baudrate
0000025497 [gsm0710muxer] INFO: Starting GSM07.10 muxer
0000025497 [gsm0710muxer] INFO: GSM07.10 muxer thread started
0000025797 [gsm0710muxer] INFO: Stopping GSM07.10 muxer
0000025797 [gsm0710muxer] INFO: Gracefully stopping GSM07.10 muxer
0000025797 [gsm0710muxer] INFO: Closing all muxed channels
0000025798 [gsm0710muxer] INFO: Muxed channel 1 already closed
0000025798 [gsm0710muxer] INFO: Muxed channel 2 already closed
0000025798 [gsm0710muxer] INFO: Muxed channel 3 already closed
0000025799 [gsm0710muxer] INFO: Muxed channel 4 already closed
0000026449 [gsm0710muxer] INFO: Sending CLD (multiplexer close down)
0000027349 [gsm0710muxer] INFO: Received response to CLD or timed out, exiting multiplexed mode
0000027399 [gsm0710muxer] INFO: GSM07.10 muxer thread exiting
0000027399 [gsm0710muxer] INFO: GSM07.10 muxer stopped
0000027400 [ncp.at] TRACE: > AT
0000028400 [ncp.at] TRACE: > AT
0000029400 [ncp.client] TRACE: Modem is not responsive @ 460800 baudrate
0000029401 [ncp.at] TRACE: > AT
0000030401 [ncp.at] TRACE: > AT
0000031401 [ncp.at] TRACE: > AT
0000032401 [ncp.at] TRACE: > AT
0000033401 [ncp.at] TRACE: > AT
0000034401 [ncp.client] TRACE: Modem is not responsive @ 115200 baudrate
0000034401 [ncp.client] ERROR: No response from NCP
0000034402 [ncp.client] TRACE: Setting UART voltage translator state 0
0000034402 [ncp.client] TRACE: Hard resetting the modem
0000034402 [ncp.client] TRACE: Modem waiting up to 30s to power off with PWR_UC...
0000075503 [net.pppncp] TRACE: NCP event 3
0000075503 [net.pppncp] TRACE: NCP power state changed: IF_POWER_STATE_DOWN
0000075503 [system.nm] TRACE: Interface 4 power state changed: 1
0000075504 [ncp.client] TRACE: Deinit modem serial.
0000075505 [net.pppncp] ERROR: Failed to initialize cellular NCP client: -210
0000075505 [app] INFO: modem is not yet responding
0000075506 [app] INFO: Still trying to connect to cellular 00:52
0000075506 [app] INFO: Power source: VIN
0000075506 [app] INFO: Battery state: disconnected, SoC: -1.00
0000075519 [app] INFO: modem is not yet responding
0000075605 [net.pppncp] TRACE: NCP event 3
0000075605 [net.pppncp] TRACE: NCP power state changed: IF_POWER_STATE_POWERING_UP
0000075605 [system.nm] TRACE: Interface 4 power state changed: 4
0000075606 [ncp.client] TRACE: Powering modem on
0000075756 [net.pppncp] TRACE: NCP event 3
0000075756 [net.pppncp] TRACE: NCP power state changed: IF_POWER_STATE_UP
0000075756 [system.nm] TRACE: Interface 4 power state changed: 2
0000075757 [ncp.client] TRACE: Modem powered on
0000075757 [ncp.client] TRACE: Setting UART voltage translator state 1
0000075857 [ncp.client] TRACE: Setting UART voltage translator state 0
0000075957 [ncp.client] TRACE: Setting UART voltage translator state 1
0000076958 [ncp.at] TRACE: > AT
0000077958 [ncp.at] TRACE: > AT
0000078958 [ncp.at] TRACE: > AT
0000079958 [ncp.at] TRACE: > AT
0000080958 [ncp.at] TRACE: > AT
0000081958 [ncp.at] TRACE: > AT
0000082958 [ncp.at] TRACE: > AT
0000083958 [ncp.at] TRACE: > AT
0000084958 [ncp.at] TRACE: > AT
0000085505 [app] INFO: Still trying to connect to cellular 01:02
0000085505 [app] INFO: Power source: VIN
0000085505 [app] INFO: Battery state: disconnected, SoC: -1.00
0000085958 [ncp.at] TRACE: > AT
0000086958 [ncp.at] TRACE: > AT
0000087959 [ncp.at] TRACE: > AT
0000088959 [ncp.at] TRACE: > AT
0000089959 [ncp.at] TRACE: > AT
0000090959 [ncp.at] TRACE: > AT
0000091959 [ncp.client] ERROR: No response from NCP
0000091959 [ncp.client] TRACE: Setting UART voltage translator state 0
0000091960 [ncp.client] TRACE: Hard resetting the modem
0000091960 [ncp.client] TRACE: Modem waiting up to 30s to power off with PWR_UC...
0000132962 [net.pppncp] TRACE: NCP event 3
0000132962 [net.pppncp] TRACE: NCP power state changed: IF_POWER_STATE_DOWN
0000132963 [system.nm] TRACE: Interface 4 power state changed: 1
0000132963 [ncp.client] TRACE: Deinit modem serial.
0000132964 [net.pppncp] ERROR: Failed to initialize cellular NCP client: -210
0000132964 [app] INFO: modem is not yet responding
0000132965 [app] INFO: Still trying to connect to cellular 01:49
0000132965 [app] INFO: Power source: VIN
0000132965 [app] INFO: Battery state: disconnected, SoC: -1.00
0000132980 [app] INFO: modem is not yet responding
0000133064 [net.pppncp] TRACE: NCP event 3
0000133064 [net.pppncp] TRACE: NCP power state changed: IF_POWER_STATE_POWERING_UP
0000133065 [system.nm] TRACE: Interface 4 power state changed: 4
0000133065 [ncp.client] TRACE: Powering modem on
0000133215 [net.pppncp] TRACE: NCP event 3
0000133215 [net.pppncp] TRACE: NCP power state changed: IF_POWER_STATE_UP
0000133216 [system.nm] TRACE: Interface 4 power state changed: 2
0000133216 [ncp.client] TRACE: Modem powered on
0000133216 [ncp.client] TRACE: Setting UART voltage translator state 1
0000133316 [ncp.client] TRACE: Setting UART voltage translator state 0
0000133416 [ncp.client] TRACE: Setting UART voltage translator state 1
0000134417 [ncp.at] TRACE: > AT
0000135417 [ncp.at] TRACE: > AT
0000136417 [ncp.at] TRACE: > AT
0000137417 [ncp.at] TRACE: > AT
0000138417 [ncp.at] TRACE: > AT
0000139417 [ncp.at] TRACE: > AT
0000140417 [ncp.at] TRACE: > AT
0000141417 [ncp.at] TRACE: > AT
0000142417 [ncp.at] TRACE: > AT
0000142965 [app] INFO: Still trying to connect to cellular 01:59
0000142965 [app] INFO: Power source: VIN
0000142965 [app] INFO: Battery state: disconnected, SoC: -1.00
0000143417 [ncp.at] TRACE: > AT
0000144418 [ncp.at] TRACE: > AT
0000145418 [ncp.at] TRACE: > AT
0000146419 [ncp.at] TRACE: > AT
0000147420 [ncp.at] TRACE: > AT
0000148421 [ncp.at] TRACE: > AT
0000149422 [ncp.client] ERROR: No response from NCP
0000149423 [ncp.client] TRACE: Setting UART voltage translator state 0
0000149423 [ncp.client] TRACE: Hard resetting the modem
0000149423 [ncp.client] TRACE: Modem waiting up to 30s to power off with PWR_UC...
0000190424 [net.pppncp] TRACE: NCP event 3
0000190424 [net.pppncp] TRACE: NCP power state changed: IF_POWER_STATE_DOWN
0000190425 [system.nm] TRACE: Interface 4 power state changed: 1
0000190425 [ncp.client] TRACE: Deinit modem serial.
0000190426 [net.pppncp] ERROR: Failed to initialize cellular NCP client: -210
0000190426 [app] INFO: modem is not yet responding
0000190427 [app] INFO: Still trying to connect to cellular 02:47
0000190427 [app] INFO: Power source: VIN
0000190428 [app] INFO: Battery state: disconnected, SoC: -1.00
0000190443 [app] INFO: modem is not yet responding
0000190526 [net.pppncp] TRACE: NCP event 3
Please help with this, it is clear from the posts that this is not an isolated incident. Also I tried to create a ticket, but it seems to be failing to submit. I have tried to submit it multiple times, and it just reloads the ticket screen with no confirmation that it has been submitted.