This has started to happen to me with a HR20-700. I lose tuner 1 with a 771 message. It started about five days ago and is always tuner 1. I now check both tuners daily and find tuner 1 not working every day or two.
A reboot always fixes the problem but it comes back in a day or two. It makes no difference how the reboot is done: menu, RBR, or pull the power cord.
Swapping the BBC has no effect, its always tuner 1 that goes out. When I run a system test tuner 1 shows failed and also the LNB test fails.
The HR20-100 I have never has a problem and they are both on the latest NR software.
Does this sound like a hard drive issue since tuner 1 will recover and start working again?
Whats the chance of getting a replacement shipped for the $20 shipping fee?