Hi, I got a similar issue.
I have an electron, which runs a small app, publishing an event and then going to deep sleep for 10 min.
It worked perfectly for a day or so, but then events stopped being published.
It logs my data to Things Speak, so there is an internet connection, and the LED is breathing cyan.
But no events are published, it cannot be flashed OTA and when I signal it from the IDE it is not responding.
I loaded tinker, but it was not responding to function calls either.
On the other hand, the 'last connection' field in the console is working, and lists the correct time the module came on line.
Could you please advise?