Hikvision Cameras Locking Up?

I have quite a few HikVision cameras (DS-2CD2732 and DS-2CD2532) installed at various client locations that completely lock up and (no ping, no web, nothing) only power cycling them will bring them back online. It seems to happen all the time. They may stay online for a week, maybe two weeks, or a little longer. Is anyone else having this issue?

HikVision is pointing at the NVR (Software Only Exacq systems), but there is only 1 stream being pulled per camera to the NVR and maybe 2 or 3 Exacq clients connected at any one time. It doesn't matter what I do with the NVR, the camera stays locked up until I power cycle it. I don't have these issues with any other manufacture's cameras. I believe it's a camera issue and not the NVR.

System Layout-
Dedicated Video Gigabit Networks
Netgear Pro-Safe Managed PoE Switches (using about 25% of PoE Budget)
Custom Built NVRs running Win-7 Pro, 8-16GB RAM, SSD, blah blah

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