I worked installing and repairing CCTV for 15 years and by what your saying it doesn't sound like a camera fault?
Check all connections and the battery and the battery being the first thing to check, Try a new battery if you have to, once your happy the power supply is ok the next step is to try and check all the connections.
Power up the system and from the power supply to the camera take hold of the connection from the battery and wobble it (keeping your eye on the monitor for the fault to appear) if the connection is ok then take the cable in both hands (keep one hand still) and moving along the cable wobble the cable close to your fingers, you are looking for a break in the cable, again keep your eye on your monitor for the fault.
The cable will be or should be a screened cable, Just one tiny strand from the screen touching the signal cable will produce the fault you describe.
If you have a spare cable then try that before all the above, I'm surprised omnipole didn't do that first because I know from your description it is not the camera at fault. HTH