same issue with mine: volume initially would do the reverse as to what it was directed to, often it was me reacting to a too loud of a volume by attempting to turn it down---only to have to blasting louder.
Now volume doesn't work at all.
Tape decks also don't work----AND everytime system is turned on the tape decks go ka-clunk ka-clunk ka-clunk ka-clunk, VERY loudly.
Not an AIWA fan, December 2009