Peplink device reboot problem

My peplink device is having trouble restarting itself for no reason. it simply disconnects all connections and reconnects itself. It happened so fast that I’m not sure if it stopped completely or not. but I will be stuck for about 5 minutes for it to work normally again. This has happened at least 3 times since I upgraded to Firmware: 8.4.1.
Model: Peplink Balance 580
Firmware: 8.4.1 build 5274