Yeah it's got to be the splitter or the cable going from the splitter, i put the box in the bedroom which has the direct feed and it was miles better, took the box downstairs and plugged it in the direct feed in the living room and it was miles better, slight graphical glitches but I wasn't paying attention to that really cos the actual performance full stop was 10 times better.
safe bet to buy a new splitter and/or a new length of cable to go from the splitter? does it need to be a certain splitter do u know?
awesome suggestion to try another room. I'd have been here all night.