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

[walterdevos]

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 pârty.
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.

 

[Infopro]

fuser -m spews a bunch of pids,

It might be helpful to post the output here.