This is something I have never seen in 8 months, before the latest 2.95 firmware update. New software, new bugs.
Towards the end of a long 5 hour session last night, the S50 firmware crashed. The WiFi connection was still up, but SeeStar would not enter stargazing mode. Some kind of error dialog box showed up for just a fraction of a second but disappeared before you could even read it and the app would just revert to the main screen. After many failed attempts I managed to screenshot the error message, I do not know if this helps with debugging this or not:

Restarting the app did not help, restarting the S50 did fix the problem but I had to go through the leveling procedure all over again. Another maybe important detail, I had two Android phones, each one with its own SeeStar app, connected to the S50 at the time.