Thanks afl1 ... I finally managed to sort it out and it had nothing to do with LibreELEC or even the KII Pro. I connected the KII Pro with the LNB out of my VU+ which till I setup the KII Pro and be happy with it, I wanted it to still be my primary viewing box for satellite. Unfortunately even with the VU switched off, for some reason about 10% of transponders fail to lock but work if I bypass the VU+. I should have checked it before, but the kind of randomness of the failed transponders (it wasn't like they all were on the same band, polarity, low SNR, symbol rate etc etc) threw me off.
Anyway, once again well done for the great work. I have been messing with Linux for 20 years and while I love it, I know how hairy it can get at times Hope I can be more useful in the future