hi everyone - i'm new here and i have a strange problem that i have scoured the web to fix. i have had no luck so far. i have the stock 8 speaker system with the amplifier under the seat. i do not have onstar or any kind of security system other than the stock keyless entry. so here we go: sometimes the radio works perfectly and sounds great but other times the volume will be blaring and the only way to get it to go down is to turn it up. when you do this it slowly goes down and when you turn it down, it slowly goes up... sometimes even when the radio volume is functioning, we'll lose volume in the rear speakers except for a scratch here and there (i think this may be a separate issue) at times when it's acting up, we can turn on the air conditioner fan and it will immediately start working perfectly. the amp seems to be working fine at this point. i don't know if it's related but the airbag light comes on intermittently as well. anyone run into this or have any thoughts? thanks so much for any help!