intermitent radio problem....help!

ok this is an intermitent problem in a 97 expedition ext 8 cyl. when the window rolls up sometimes the radio cuts out. sometimes it comes back on but other times it stays off.... any suggestions??? is the window regulator in the same circuit with the radio or something??? i was also thinkin about what if the regulator is hitting an unshielded speaker wire and causing it to ground out..... never took off the door panel and checked it out yet tho....