If your monitor has been replaced to eliminate any possibility of a defect, but you still encounter interference problems, then your monitor would be considered non-compatible with your surroundings.
There are several things that work on the same frequency as your monitor. You may have to eliminate them in order to allow your monitor to work. Also, items outside of your home - such as what your neighbor may have - that work on a radio wave frequency can interfere with the performance of your unit.
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