I live my nextel except for that problem. I got a call while I was in front of my computer and was hearing that darn crackling sound out of my speakers. I swear I could feel the tumor developing in my brain.
I did witness some interferance on an AM radio with my nextel. Only when I get a call though. I was tuning my GT4, and I got a call. As the phone was ringing, the servos started twitching. Also, a guy with a huge CB antannae I think caused my servos to go wacko. Also, dont forget those Sun bursts. That occurance where the sun send out bursts of energy that messes with radio waves. I also believe that there are some weird spots where there is constant interference. Where we run, there is a spot we always warn people not to run past. Once they do, the car runs away If they dont have a fail safe.