Morning folks, first post on here so be gentle

After much reading on the AVS forums I put together a system consisting of:
Samsung LN52A850
Denon 889
Playstation 3
SVS SCS-01 speakers
Motorola DCH-3416 HD Cable box
Both the cable box and PS3 feed directly into the receiver via HDMI and from the receiver to the TV via HDMI.
For the first week eveything ran just fine, but this past week I've been experiencing issues with HDMI consistently. No matter what the feed is I seem to lose my video signal to the TV. The sound keeps playing so I doubt it's from the source devices and it's happened both while using the PS3 and the cable box. The TV will just lose connection to the receiver, sometimes it recovers after 20-30 seconds, sometimes I need to reset power on everything several times to get them working together again. It appears to me based on the symptoms (TV loses video signal, sound still plays) that this is an issue with the receiver or the TV.
I thought maybe this was a heat issue with the receiver maybe? The receiver is in a pretty open enclosure, the only sides "blocked" are the left and right, plenty of breathing room on the top/back/front of the receiver.
I was thinking the most logical test would be to hook up some of these components directly to my TV to see if the issue is with the TV or the receiver, but I wanted to check here and see if anyone else has had similar issues. any feedback would be appreciated!