I have had U-Verse for over a year. Initially its HDMI output was fed to the HDMI input of a different receiver.
About 2 months ago I purchased the 1121-K, which I leave on 24 hrs, and connected the U-Verse box (called the box as we go on) to an HDMI input of the 1121-K. All was well for about a couple of weeks. Then I noticed that the box was, at times, recycling its start up procedure. This continued to get worse until I felt I needed to get a tech out here. BTW, I also had a box on 2 other TV'S which did not indicate any trouble through out.
Technician came and couldn't find anything after lots of checks but replaced the box. All well again for about a week then all repeated. Another box and then on the 4th try switched boxes and and exchanged bedroom non-dvr box with the a new DVR box in the bedroom and only put a tv box in the place of the one that was always going bad.
Well no good, after overnight I noticed the non dvr box was starting to show repeated restarts.
Well, for some time I had thoughts that the HDMI connection to my 1121-K and the U-Verse box maybe the problem since there have been reports of HDMI problems with the U-Verse boxes but I could not find a similar case on the web.
But I went ahead ahead and connected the box to a component input with an optical audio input. (I hated doing that.)
Well, that seems to have stopped the problem. I then did some more Google searching and finally found a similar case in the forum "http://www.uverseusers.com/
Again U-Verse does not tell you anything about and all 4 techs and the call center did not say or know anything about this problem. But, as I mentioned there has been some reports of HDMI problems and some techs have been quoted as saying they won't use HDMI and only use the component, if available.
This receiver uses an HDMI 1.4 version and after a long review of the manual ,I did find a very short paragraph that states that this receiver HDMI may have some problems with some equipment. No reasons or what equipment .
I am glad I have it fixed but I am disturbed at both U-Verse and Pioneer about the poor knowledge and information.
I am in the third day now and all is well. I almost went back to Time Warner. I would have if this fix didn't work.
I wish I knew what was the exact cause of the problem with the HDMI connections. These are first class HDMI cables and certified for ver 1.4 HDMI.
BTW, all of this is with a home theater system that has 4 other pieces of equipment connected to the 1121-K with no troubles. Lots of care with all cables and surge protectors,etc. I have a background of life long electronics.