The problem I'm reporting does not concern my Briar setup (I'm using LineageOS 14.1), but my friend Briar setup. She uses a stock Android (can't check the version right now). Here's what happens to her:

• when she power-on the phone, Briar autostarts and asks for the password
• for some time she appears logged in and we can send messages each other
• after some time (less than half an hour) she appears offline and she does not receive any message
• even if she starts again Briar and logs in again, after some time she's put out without any notice

I could not see any obvious mistake in her configuration. But I'm very new to Briar, so do not take anything for granted.

Any hint on how to debug this problem is appreciated. Thanks in advance