Tvheadend

On Tvheadend 4.2.3-20~g407c8a3
(and earlier versions)
On an Ubuntu 16.04 container - with nothing but TvHeadend installed...

After spending hours to map EPG sources (now 4 times), after a reboot most of these sources are gone... It leaves 5 or 6 channels with intact mapping, the rest is blank...

My setup is downloading an XML, that is unpacked and then fed (via cat) to the xmltv.sock "External: XMLTV" grabber...

It is baffling that it is not always the same channels left "untouched", and it is not like there is some logic behind - like they are the only ones that can easily be mapped from the name or anything...

Really frustrating, any help will be appreciated..

-Tony