Camera View-Split Screen Problem

I am looking to see if anyone out there can provide some advice as to whether this is a typical problem or not, what causes it and approaches to fixing it. Thanks in advance!

We have had some recent problems with 4mp varifocals, and now a 3MP PTZ displaying a split and/or "rolling" screens. Does anyone have similar experience with this? Our initial installations went well, everything displaying properly for a month-3 months and then we get the call that the customer is getting a split screen on one camera. The bottom half of the VMS image is often displaying on 1/4 of the top of the view.

Thanks for your help!

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