Just bought the Roamio yesterday. When I try to rewind tv, instead of skipping back at its regular pace, it starts off skipping back and then jumps back about 10 minutes. I am so frustrated with this new unit that I am about ready to throw it at the wall. Also, just tried it again, and now it has not recorded currently playing live tv. It has been on the same channel and I can only go back 11 minutes! Arg!! Could it be this particular box???