We have three small business PoE switches, SG220-50P purchased from two places. They are each randomly rebooting at different times every few days, and sometimes only after a few hours. They have been doing this basically since we purchased them. I initially thought the devices were defective, but I haven't seen anything regarding this model, and I wouldn't expect to get 3 bad ones from two different sources.
I've enabled flash logging, and nothing abnormal is recorded, it's not even showing power down. They just come back up as if it were a normal boot. I updated the firmware two times now, and that hasn't helped. Resetting to factory seems to help for a while, but then the problem comes back. The devices are on a UPS that isn't overloaded. They are each consuming about 35W on PoE, with a max of 375 available.
What would you recommend to troubleshoot this issue?
I'm new to networking admin, so sorry if my question is unrefined.