I've had these two gammas for about a month and they keep resetting themselves. I was thinking maybe the pool was the issue, so I put each device in different pools (braiins and solo) and I even unswarmed them, and both sessions only lasted 3 hours! They both reset at the same time. Any ideas here?
Are you using an ASUS router per chance?
Are you using the latest software version?
I'm having the same issue and it can happen in as little as 10 minutes or as long as 5 hours or more... seems to be completely random. The longest it's ever gone w/o a reboot was about 7.5 hours.
Assuming you are using the latest firmware version, I would also check to make sure the miner is getting a good wifi signal, check the temps (at or around 55c is ideal), and what are your frequency and voltage readings? If you have tinkered with the frequency/voltage I would recommend setting them back to default, at least momentarily, and testing from there.
Every now and then the firmware may reboot in resonse to a plethora of potential issues, such as pool closing the tcp connection, socket errors, etc. Here are some known issues that could potentially be related https://github.com/bitaxeorg/ESP-Miner/issues