So nobody has the same problem with live TV and Tvheadend in LibreELEC 8 on any other platform?
It seems strange that this issue exists on Cubox alone and that it is so specific (channel switching in Tvheadend client). It is a basic functionality of PVR client to be able to switch from one channel to the next. On the backend everything works ok, the issue is only in Kodi. Should I make a new post, not specific to Cubox?