Try Resetting completely using the button inside?I've noticed my SD card has disappeared from my 5231 cams.....currently on :
System Version2.640.0000002.0.R, Build Date: 2018-05-23
Anyone experienced this? is it the firmware? should i revert to an earlier one or upgrade to newer? or try restore to defaults or something?
The 2 cams this has happened on also are constantly losing connection too..ie "no signal" Error 8000274d (refused; check ip)