I have this problem as well. First time in at the dealership they told me they "cleaned the switch's contact pins", which naturally did nothing.
Seeing as how this is a common issue with a TSB they should definitely have known better.
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Current: 2023 GRC Circuit Edition, 2012 C63 AMG P31
Past: (2) 2000 MR2 Spyder, 2017 GTI Sport, 2006 Porsche Cayman S, Supercharged 2013 BRZ-L, 2007 Honda S2000, 1992 Integra GS-R