Lately, my radio seems to cut-out, or nearly so. Then after hitting a solid bump in the road, it sometimes regains it's volume. I took it out and the wiring & connections appear OK. Tried moving the antenna a bit too. Is there some simple possible solution to this. Kinda miss the radio just when it cuts out like that. Banging the dash has, at times, brought it out of it's sudden silence. Do Delco radio's go bad like that? Any help would be appreciated. Thanks.