987 stereo reception

[super66]

Do any of you guys get a lot of static....here is what I am experiencing, static, then I'll drive and get this great sound, which some will argue isn't possible, but out of nowhere it seems that the sound fades from some of the speakers....drive a little further and it comes back full force....

my wife's nissan doesn't share these complications and btw works well with an iTrip....my stereo on the other hand pops and crackles with the iTrip and cuts in and out with reception...

I took it to the dealer and they found nothing wrong....no surprise on that for me....but my concern is I'm installing an FM modulator soon to cure the iPod problem but want to get the reception addressed if it is a problem....

my biggest fear is that porsche will blame my modulator and try to stick me with a repair....I've already expressed this to them....

so do you guys have the same/similar experience????