i have been using vim since v4 (1999?), but in the last year+ - maybe since v9? - there's some weird defect happening only once in a while:

While walking around a file with keyboard, sometimes a random line's indent is removed - that is, text goes left-flushed. AND it's not a tracked change that can be UNDOne - as if it never happened / always has-been-so. Have not been able to correlate this to any other thing. It happens like once a few days, very rarely it might happen twice within minutes. Sometimes i notice that, sometimes i don't and (luckily) python screams of broken indentation. If the file isn't deeply nested python.. good luck.

Has anyone "achieved" such a thing?