A strange problem that is happening occasionally on my Win98SE
laptop...

The volume seems to increase by itself, without me dragging the bar on
the Win98 volume control. I double click on the volume control, and I
see that the slider on the left is set on maximum volume, when I had
set it much lower. So I drag the slider back down...and then watch as
it slowly creeps up again all by itself, as if moved by a ghost.

When this is happening, I try to check the "Mute all" box and cannot.
It won't accept my click.

This is only happening sometimes, but often enough to be annoying.

Any idea what's causing it?