Hikvision Freeze, Or Frozen Displays

I have VMS with 3 different servers on it, all Exacqvision. I have about 30 cameras per server and I added 3 new Hikvision 2132 cameras to the system. All worked fine for the 1st year, then on a regular basis only the new cameras go to sleep, stop working, freeze up. When I get back on site I find they froze when their is no activity. During the wee hours of the am early morning. 11 pm to 4 am . not always the same.

I unplug, re power up and everything works fine. back to normal.

In troubleshooting I change settings on the cameras either constant, variable, or other settings , they work for a couple of weeks then I go back to reset them . the cameras are 2-3 years old , only happens with the 3 mpxl cameras . All other 60 cameras ok , all gigabit networks with gigabit poe switches, all Cat 5 e infrastructure

Any suggestions? Has anyone had these problems with their systems or hikvision cameras?

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