I am also experiencing problems with the motorola dct6412. In my case, when my tv is off, the cable box clicks on and off. You can see the time reset. Also, when watching, sometimes, the signal will get interupted for a split second.
I had my box replaced twice so far with no success. The cable co also resent the signal to the box to reset it a nyber of times. This last time, the cable man said he knew the problem, but could not fix it. It was the HDMI cable. He said all the boxes that use the HDMI connection were having the problem. We tested this on my box, by disconnecting the HDMI connection, and used the componet cables I have for my DVD connection and it fixed the problem. So, any of you guys having a similar problem, are you using the HDMI connection? Anyone else having this problem? Any fixes that are known?