My DCX3400 dvr is very slow to respond when I use my remote. This started happening about 2 weeks ago. For instance if I try to get to channel 13, I can push 1 but not 3 and the dvr goes to "1" on demand, or I'll hit 1 then 3 again and again and channel 133 pops up. Or if I'm searching my recorded programs I have to hit the scroll button several times before the DVR moves down the list to the next program. I got a new remote control from Xfinity but still have the same problem.