Dvr live tv only a few channels working

When dvr was in beta it was working fine for me, but short after is was out of beta only a few channels are working.
I get the error: an error has occurred while attempting to play this video. Please try restarting both the plex media server and this app.

The channels that are working do not have teletext or DVB subtitles.
But the most channels have this so it is not working.
On my iPad/ plex web it is working but with a teletext overlay, so not usable.
This is with my plex server on my synology Nas.

With my plex server on the shield, the channels without teletext and DVB subtitles are working too, but the other channels are working not at all even not with the iOS / plex web.

Is there a way to solve this?