So how many do you have and how many show this behaviour?
Is it possible that you switch one of them to the beta channel? I then get a little bit more info.
My Ropiee is randomly rebooting ever since I started using a different power supply. It works fine for days at a time, but unexpectedly reboots. Could the power supply be to blame?
Which model of raspberry? What are the specs of the power supply? Do you have any hdd usb connected to the rpi ? are they usb powered or do they have their own psu?