Sorry. That is not correct. I found the solution. The grouping option should be changed to 'Provider or Genre' instead of default 'Network or Country'

Channels are not lost. They are just moved to various other groups. But in the channel navigator interface I still see them under old group,

I did a initial scan which brought up all IPTV channels in their respective folders. Recently there has been some updates in the M3U file. Some groups were removed from M3U file and the channels have been moved to another group, But even after doing a rescan, the group information is not updated in ...