I have a 501 with a super dish. My old receiver would lock up each time the channel was changed. Would reboot and go to step 5 of 5 when acquiring signal, then power off and reboot again - would take about 2 hours to get back up again, then fail when channel was changed. I thought it was the receiver so I bought another 501 - this is a new 501. Everything seemed OK, but I only am receiving sat 119 - needed to do a check switch - First time check switch seemed to progress normally then it powered off and rebooted - now this does the same thing as the previous receiver - goes to step 5 of 5 then reboots itself - it only takes about 10 minutes and it comes back up, but each time I try to go to check switch, it locks up as soon as I hit the check switch button and start the process again. Suggestions??