Has anyone run into this one:

Our '95 E320 Radio Volume Control is .... weird. In warmer weather it operates just fine. but with the weather getting cooler, in the mornings, I can turn and turn (fact. radio with the round volume knob) and it either doesn't affect the volume or as I turn it clockwise the sound level goes down!

This is true for both AM/FM and CD. Any ideas? Any DIYer solutions?

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)