Message "one or more items failed…..KODI



Good morning everyone,
I’m sorry but I do not write  English.

I have a problem (and I think you do too) with Kodi 21. Really, I have 2 problems.
The thing concerns Decoder Android Telesystem TS UP4K.

1) I have several DVD disks and VHS that over time, I have digitized to DVD format and stored in a NAS so as to watch them with KODI. As long as I install KODI 20.3, everything works fine, after the update to KODI 21, I get the error “one or more items failed to play. check the log for more information about this message”. All the guides I found on the internet have not solved it. If I play MKV, it works perfectly. Solutions?  (i do not wont to reconvertet dvd to MKV format .. iI prefer to kill myself )

2) I installed Kodi 20.3 as recommended by the KODI staff but I can not block the updates in any way, A few hours later, the 21 is installed.

Ideas on this? 
Thanks in advance.