so i take it this JUST started happening today?
do you have any aftermarket radio/ AV parts installed? does this happen on a AM radio station?
if you have SAT, does it happen on SAT?
did you remove power to the unit recently?
does this happen anywhere in the city? and you can repeat this every 30-60 seconds?
does it sound like inter-station white noise? or some other type of noise?
are the connections on the back radio antenna on the glass in good shape?
does the radio display change during this issue?
and once the issue starts does it go away or do you have to turn off and then back on the radio?
also when the issue is going on, what happens if you change channels? does the noise or lack thereof continue or does it go away once you change a station?
dont use the preset buttons, rotate the seek knob manually to test.