Im guessing you have drink holders above your radio?
Sticky knobs are no mystery in that case...dumb design.
Its true that some folks get a nervous excitement while driving their 986, so perhaps thats the cause 
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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