What settings are enabled on the cameras? Motion/sound detection? Email and/or FTP notifications? Recording to SD card?
Do they all go off about the same time?
Do they seem to be running hot? Are any in a window sill?
I've noticed with some cameras when there are a lot of settings enabled they can get bogged down and need a reboot. My 930 hasn't been rebooted in years but my 960 for example seems to need a reboot once every week or 2.
You could try some kind of smartplug and set a timer to turn off/on like once a week to see if that helps. I wish there was a reboot option in the app or UI like our routers.
Sound detection is enabled on all the 942s (not an option on the 930s). Motion detection is not enabled so email/FTP is not enabled & not recording.
The 942s go off line within 12 to 24 hours of each other. I have not noticed the cameras being warmer than normal. The only camera in a window sill is one of the 930s. It has not been rebooted since the last power failure a year or two ago.
A reboot function on the app would be wonderful. I’m not going to buy a smart plug to fix this. I would rather put the money toward upgrading to a better brand of camera.