In this issue tvh isn't recording, just providing livetv.
I will test if recording to usb attached SSD will improve the situation.
dvb card - > USB2
sharkoon xt duo 2 port dockingstation -> USB3
If I start recording on dockingstation and start playback of this recording after some seconds I get the same errors in tvh.
If I'm starting livetv and start filetransfer through ssh mc from first port on dockingstation to second port on dockingstation I get the same errors.
So neighter recording to usb nor file transfer on dockingstation work.
Could there be an usb issue on rpi4?