There is a regression in latest stable LibreELEC 11. Detected with a fresh installation of LibreELEC-Generic.x86_64-11.0.3.img.gz . The issue was not there in LibreELEC-Generic.x86_64-10.0.4.img.gz .
When using simple, generic live-tv with a PCI DVB-S2 card at some time the TV-channel list is gone. Its back if the computer is been restarted. Its described here with more details and logfile: RE: Intermittently spinner in video and live tv stays visible - channel list empty after stop