Hosa (CAIG) DeOxit is the absolute cure.
All 4 knobs of the Navi system Bose pull right off with very very little effort required. Spray the DeOxit into the area (have a towel around to absorb liquid run off) and start twisting the pins that hold the knobs to work all of the cleaner inside. Twist at least 10 seconds per knob.
All 4 controls are now working 100%.
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