if your using an AM radio then it could be a number of things ......... when we run at our normal site every weekend..... we have the same kinda "glitching" occur and its more than just one car that does it we have narrowed it down to a power transformer on a pole about 20 feet from the end of our track... and it seems to affect the AM guys mostly....... i have noticed it when i run my mini (which is using stock radio) but when i run my NTC3 or my rc10gt i use my M8 which is FM and i have never glitched out there................ it could also be your antenna wire rubbing on metal or carbon fiber( if you have any) i have heard of these two casueing glitching