As I said: more that 8.1.1 -> 8.2.1 is a higher version?
So, if I gave not enough logging based on how_to:provide_logfile [LibreELEC] can you kindly explain how to do it?
Finally I found a solution: caused by Samba (for now all works great)
If somebody has problems with slow running audio/video files through samba protocol, try add in smb.cfg:
oplocks = no
To be sure check in log files for: Oplock break failed for file ...
Mentioned flag could be a solution.