Failed to remove runtime directory /run/user/1066: Device or resource busy

Hi All These messages are plaguing us for years now: Failed to remove runtime directory /run/user/1066: Device or resource busy There's another thread about this issue, but it leads nowhere. (=lots of guessing but no solution) fuser -m spews a bunch of pids, and ps makes it a p"rty. :oops: But i'm still out in the woods about what's actually causing the issue. Can someone tell me what to look for in the output? I would just write another "if this than ignore that" rule, but it would actually be nice to have it dealt with instead. In advance: Thank you for your time, much appreciated. :)