Hiding the solution in a PM?! Seriously. Thanks for no help, I have a client with the same exact issue and if it's going to be this hard to get a solution I will simply recommend they change to a Sony TV. Thanks for nothing.
There was another thread on connection issues-this one related to SkyQ but there may be relevant information myself and others posted-regardless of connected devices. https://eu.community.samsung.com/t5/TV-Audio-Video/QE65Q7FN-loses-Sky-Q-box-after-being-in-standby/m... otherwise Mod may advise info received fromTv experts.
apologies for anyone who requested an update from me, i have other things to be getting on with in my life than checking back on a now redundant thread issue.
the issue was resolved by Samsung, they replaced the mother board in my tv.
if you have the same issue, push for the same response i got.