I’ve got this same issue. Most of the time the EN pin can reset the Boron and the Boron will come back to life, but other times it does not work and I end up in a scenario where EN is pulled high, there is 3v3 power, but the device’s LED and nRF do not come on.
@psychogenic – we’ve got a very similar setup to yours.
We are running v1.5.0 device-os.
Is this related to I2C power being backfeeding to Boron? We use I2C in this application with traditional 4k7 pullup resistors. I’m wondering if it makes sense to use our watchdog uC to pull the I2C lines low for the period before and during the time it pulls the EN pin low.
Any other ideas on what might be the cause of this? Could it be related to the newish power_manager features?