Pontiac 6000 radio keeps getting soft
The radio of my '86 Pontiac 6000 STE starts out extremely soft when I start the
car, then after a little while suddenly goes back to full volume. While it's soft, I
turn it up to hear it & I also hear intermittent noise almost like static that cuts in
and out. Sometimes it gets soft (when it's loud) or gets loud (when it's soft)
when I hit a bump in the road.