That was a bodged installation, IRRenewal.
The only odd effects I have seen are huge bands right across the screen caused by airliner radar taxiing in front of you, and the occassional single "strike" which appears in the middle of clear air.
Any consistent grouped returns have always been real seriously bad turbulence - the sort of stuff which will bang one's head on the ceiling.
It's not an expensive thing - of the order of a few Łk which is cheap on the scale of most avionics.