I have an HR-34 along with an AM21 tuner to pull in my locals from an off-air antenna. After about 30-40 minutes I lose the audio on 2 of the off-air locals. In Ft. Lauderdale it's 6-1 and 7-1. It starts out choppy. than gone entirely. This only happens on these 2 stations and has been this way for quite a while. I have the unit hooked up via HDMI to my Sony Bravia. I tried a different HDMI cable without success. Just seems odd that it only affects 2 channels. Anybody else haved this or any other suggestions? Thanks.