Can anyone help please

I have just bought a KD65 A8f and a 1080 receiver 3 weeks ago. Im getting ARC issues. When I stream videos the sound breaks up and then no sound at all. I have to do a factory reset and then the handshake is OK for a while ..then the hanshake is lost again. Its driving me nuts. I want to enjoy atmos and its so intermittent. Any help would be greatfully appreciated. This system has not been cheap and I dont want to regret the purchase.