Check that the faceplate contacts are clean and are making proper contact. I would take it off and then put it back on again. On my old one, it would do stuff like that until I pushed against it and then the controls would work. I replaced the cover which was cracked and now I have no problems.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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