I've got a question about some problems I'm having with my HR21/700 receiver. I am using a SLIM 5 non-SWM antennae and an 8 port SWM switch in the house. When I record HD programming or rewind an HD channel the reciever starts responding very slowly, including picture and sound breakup. Sometimes it's to the point where it's unwatchable. When watching the same channel live there is no problem. It's only a problem during playback of HD channels. I'm fairly confident it's a receiver related problem because I have another HD receiver(HR20) on the same setup and have not seen these problems. I'm trying to decide whether there is anything I can do to fix the issue or if I need to talk to Directv about replacing the reciever. Thanks!