Error "server not powerful enough" on EX2 Ultra, although videos could be played before

Hello,
I need some help with my Plex server on my WD NAS.

I’m getting the Error: “This server is not powerful enough to convert video”
when I try to play some videos. Playing these videos was working before.
Most movies can be played but most of my TV shows won’t play and result in the error. I don’t understand the problem since only 2 weeks ago I had no trouble playing these videos, they are rather small and not high definition.
Here are xml data from some videos:
Plex - Nas Problem.7z (21.0 KB)

I’ve tried with different settings for Plex Web Quality and I had to reset the NAS.
I reset the libraries but with no effekt.
I know that my PC can play the files but if I open/start the video in plex (via chrome browser) it results in this error.

I’d be very glad if someone has ideas or tipps how I can resolve this issue.
Thanks in advance.

Server Version#: 1.21.0.33616
Player Version#: LG WebOS TV Plex App version 2.2.0
Player Version#: Plex Player via Chrome
I’m running the Plex server on a WD MyCloudEX2 Ultra (Firmware 2.40.157)

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