What do you mean by tearing? Can you provide a capture of when this happens? with out the red lines?
Might try factory reset, manually load FW again, factory reset then set up from scratch. Might try not configuration motion detection at first to see if this happens again, then configure motion detection and test.
Is the camera set up to get a automatic IP address from the main host router or a static IP address ON the camera?
Any other cameras installed or is this the only one?