I have just purchased a new LG tv which is connected to my 5.1 surround through a Pioneer VSX-LX53 amplifier. Initially sky input was working with full sound but watching through tv options such as amazon prime had no sound. I have set up ARC through HDMI on both devices and now have full sound when watching amazon prime through TV/SAT on the Amp. What I find odd is I turn everything on the Amp starts on HDMI1 for sky, it then switches the TV/SAT briefly and the picture goes, then after 5-10secs it switches back to HDMI1. Is there anyway to stop this ??