The issue you are having could be caused by a number of things but the most likely is either interference from a transmitter in the same frequency range or the Monitor has a failing capacitor on the board.
If you can think back to when the issue first started and check to see if you have any new devices that might be on the same frequency range and test them by turning them off for a while to see if it continues though this would not be effective if you live close to anyone else.
If that does not work then use high quality batteries and make sure the unit is placed far away from any windows in the room also make sure any florescent lights are not in use near the unit and make sure its not next to any thing else that uses a power supply that has the square box on the plug that includes using the same outlet.
This particular device use's a low frequency range around 40mhz which can be prone to interference more then a lot of the newer units that use 800mhz to 2Gighz.
If all of the above fails you will have to replace the unit or seek repair from the manufacturer if it's still under any warranty.
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