If the DVR shares a PSU with the cameras, start by checking that.
Generally, cameras draw more power at night for their IR illuminators, which causes weird and wonderful things to happen if the PSU isn't up to spec.
Also check the firmware version and check the Manufacturer website if there is an available upgrade. Definitely swap out the power supply for a couple of nights to check if that is the root cause.
DVR is rebooting several times overnight (Lorex system)
in Digital Video Recorders
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Also check the firmware version and check the Manufacturer website if there is an available upgrade. Definitely swap out the power supply for a couple of nights to check if that is the root cause.
Good Luck!
Sriku