Quick question. My Hopper 3 has been very slow lately in changing channels or skipping forward/back. It takes about 3 seconds to complete any action, with a black screen in between. I called in to customer service today, and the agent was convinced it was because I had a very low signal on 72 (38). So they're sending a tech next week to fix that. But I'm getting slow response in changing from one OTA channel to another, as well as on recorded DVR programs. This would seem to have nothing to do with signal strength. Thoughts by the pros out there?