Did you use some illegal IPTV provider that ask you to run a .sh file from the command line and that install automatically the channel list for you?
Those simply suppress all the favorites including blacklist then install a program on your box that automatically refresh silently the favorites but they delete all you existing setup.
So you will also lose also the blacklist definition everytime they run there update script.
I am using the Parental Control since many years and I can ensure you that it is working fine.
Edited by Pr2, 21 December 2020 - 17:50.