I finally got the problem back. So I attached the logs. The only thing it is that it now responded that the channel was scrambled. Although I have a subscribtion and a working cam. I had to shutdown the server and then boot it again to get the channels unscrambled again on that tuner.
The thing with this setup is that I have two different CAM modules inside two FloppyDTV tuners (except one is a FirDTV).
So it may be a CAM issue or a tuner issue in this case. The weird thing is that it does work after the shutdown/boot cycle again. So it does work in the basics.
The recording failed some minutes into the recording that started at 16:15 in the logs and then later on at 20:00 it tried another channel that was scrambled, it also recorded a unscrambled channel with success but that recording never stopped anymore. So the guestion is why did it suddenly fail the unscrambling? Does anyone know if there is a known issue with using different CAM modules with Fire/Floppy DTV tuners?
Btw, I could not attach the error.log since it as 0 bytes.
In this example the signal level and quality quality are logged as very poor (32) and a few times as no signal (0). This does not necessarily have to be the problem, the logging could of course be wrong.