DM800HD PVR Clone tuner configuration empty - Can`t find Tuner A: Tuner Empty - 2 new boxes , 2 suppliers - Is it my LNB / Cable?

Ok bought a DM800 Clone for a mate for his second box , started setting up - straight away was not locking any transponders , hour later - Tuner A : Empty! , Sent Back.

Bought a second one from elsewhere, setup , all working , 1 hour later , Greyed out channels , Tuner A : Empty????

I have a std quad LNB on a zone 2 sly dish , 1 feed to my vu+ Duo , 1 To my Sony Freesat HD , 2 spares , Could the lnb be blowing the tuners? the Vu+ and Sony are fine? , strangely doing a scan on an openbox on the sly dish has always resulted in a few missed transponders which is wierd too!.

Just dont wanna keep unplugging my motorised dish to set things up.

Thinking of replacing cabling and the lnb for an inverto just to be sure , or is it just conincidence???

sim2.10 , i did change the image to ply image using ssl82 so would make sense! , why would it work for a while and then stop all of a sudden?

i had all channels running , then it froze , re-booted and no tuner installed???