"Open channel for record in background" does not work correctly

#1
At first after the start of ProgDVB (Windows 7 32, x86 7.35.0 and 7.35.1), recording an IPTV channel with the option "Open channel for record in background" works correctly. But later recordings after a certain point (running time of program or number of recordings - I don't know) are going wrong - the program starts playback when starting the record and after a few minutes most playbacks are srambled - and the records unusable.
This behavior was not there in my previous version (7.32.7).

My current workaround is the option "Open channels without playback" in the ProgDVB Options, but I can't view channels then. Or can I?

Thanks in advance,
Holger