Same here. MBPro 14" 2021 M1Max OS12.2. Three finger salute; ^up, nothing works except restart of computer. It will work for a few hours, then stop. I also have the trackpad tap not working most of the time. Control and Shift tap takes at least three taps to stick. Control/C, Control/V, Control/Any key won't work unless C, V, Any key is pressed at least three times.
I believe it's software since Monterey. It happened on my 2018 MBPro after Monterey and I thought the awful butterfly trackpad/keyboard was toast so I bought new computer.
AMSaipan
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