I currently have C61K hooked up to my main TV (for 4K) linked to an HR54 on our bedroom. Every so often my C61K loses sync with the TV (I have the receiver hooked up through AVR to TV) when I change channels. The screen blanks out waits a few seconds and then I just get the no signal from input screen on my TV (LG6500 55"). Sometimes it comes back, other times it just sits there like that. I never had this issue when I had this TV hooked directly to the HR44 I had previously. I have tried native and non native resolution, a few different HDMI cables (using the one DirecTV left and one of my own). It's annoying. Why would this happen with this box and not the old HR44?