Nothing special happens when the device enters deep sleep. I'll continue to monitor it, but it really is puzzling to me how last week it could go half a day in deep sleep and still connect just fine, but now it will just refuse to do so. Data-limit hasn't been reached either. I've reset the device a couple of times now, and also flashed the firmware a few times again, but it seems that I need to go through the setup process again before it'll work again.
case SLEEP: Serial.println("going to sleep now..."); delay(500); System.sleep(SLEEP_MODE_DEEP, 86400); break; } }
Also if you wonder, reading this made me believe that deep sleep clears the configuration in the UBLOX RAM. However, as I mentioned it worked before while coming out of Deep sleep, so I don't think it's very relevant to my problem.