I was plagued with this for awhile, but usually only when driving with my girlfriend or if she'd used the car by herself.
She'd report that the empeg had done a really weird thing while she was at the store or whatever, and it was just playing all by itself when she got back.
I was baffled, cause I couldnt replicate it.
I finally figured it out one day when I spotted her turning the volume knob down after I'd turned the car off, removed the key and gotten out.
She said she was doing this so it wouldnt be so loud when she started the car up again.
Doh!
Mystery solved.
I gave her a spanking and a quick lesson in empeg usage and now all is well.
Z~
Oh, and I also reduced my standby time...