Electron E-series 3G slow connection unless reset button is pressed

My board based on e-series 3G has this weird behaviour on startup, system in automatic mode and empty setup() and loop():

  1. Green LED flash for 1-2mins
  2. White flash for a few seconds
  3. Green flash for 1-2min
  4. Blue (connected)
    Sometimes the device fails to connect and it keeps looping 1-3

Yet, if I press reset a few seconds after 1. the devices reboot itself and connects to cloud (blue light) very quickly (1-10seconds).

Any idea?

What device OS version?

DeviceOS 1.0.1