The receiver doesn't have HDMI input unfortunately.
The thing is, when connected to the TV and using the HDMI for audio through only the TV - it doesn't drop out. And it was working perfectly fine one day, and the next it started doing it out of nowhere.
I connect the DVD player to the TV via HDMI still, but connect it to the receiver via Digital Coaxial cable.
*edit*
Alright, trying something out here. I have a digital fiber optic cable connected from the TV to the receiver. Since HDMI carries both the video and audio, it still has a high quality run. If it doesn't drop out with the fiber optic cable, then there has to be an issue between the digital coaxial out to the receivers in.