So a couple weeks ago I started losing signal on some HD channels. The message on screen is 'Signal Loss on HD Channel' and it switches the channel to SD. The HD channel works for a minute or 2 before it switches. I ran a Check Status test a few times and the error reported is either Port 3: No Signal or Port 3: Low Signal. I'm not sure why this started all of a sudden but there is a tree nearby that may have grown enough that it is interfering with the signal. Is there anything else I can do before scheduling someone to come out and realign or move the dish?