My right Ctrl key often ‘sticks’ on in a particular circumstance. It looks to me like the physical key is back up, but it looks to my computer like it is being held. It unsticks when I tap it again. I’m not running any plugins where that is expected behavior.
It’s a thumb key of course, and the circumstance that makes it stick is when I co-press it with its neighbor. To be exact, my right thumb row goes Alt-Ctrl-Shift-Space, and Ctrl-Shift often causes Ctrl to stick.
“Often” might mean anywhere from 15% to 50% of the time in daily use. I haven’t counted, can’t say more precisely than that, especially since I now usually just tap Ctrl after Ctrl-Shift as a matter of course.
I have not noticed this key sticking when pressed alone. I rarely co-press it with its other neighbor, but so far it has not stuck then either. Possibly the sticking has something to do with pressing it off-axis.
It can happen after many uses of Ctrl alone, but after 0-5 further uses of Ctrl-Shift it tends to stop happening for some indeterminate length of time.
I have the quiet click switches that were in use for mass production run 3.
I am not using any plugins like OneTap, Qukeys, etc., where sticky modifiers are an expected behavior. My firmware is a very slight variation of the default Model01 firmware after commit 03bee4b8 (2020-01-15). I switched to Dvorak, reordered the thumb keys for my small hands, and put tab on fn+bksp instead of delete because I tab so much.