[VictorG]

My server (dvbviewer) is on a separate pc, and it does take a while to start up if I reboot the server.  That's inevitable, everything can't just start instantaneously.  So by the sound of it you need to either delay starting kodi until your backend is up and running (which could be done by changing line 2 of the script) or start kodi with pvr disabled.
Personally I don't like my pvr clients running all the time - I don't use it a great deal - so they're mostly turned off.

 Yes, for the moment I delayed the start. But the point is that I never needed such delay for the last several years that I have been using Kodi+MP, daily, cos is the way I watch TV at home. So something definitely went wrong somewhere. Also my other PCs experienced performance problems because of windows updates lately.

Thanks and Regards