I've been experiencing this but I kept forgetting to report it. I've not been able to find a way to replicate it.
Also had a weird thing happen earlier. Went to type and pressing one key spit out 9 of that letter. Never seen this before
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I think it has something to do with mounts. Every time it has happened to me I've noticed because hitting a doesn't dismount me, then I do what anyone would do and mash keys for a second and notice that everything is in caps.