I have 3 HD DVRs, all bought and installed at the same time. Starting last week, two of the three lost the local HD channels. They say "searching for signal and the 771" message and change from whether they're looking on Sat in 1 or Sat. in 2. The third DVR, though, still has the channels. At the same time, my friend who lives about 4 miles away had the same issue occur on both of her HD DVRs. The regular receivers and old Tivos we both have still get local channels, they never were in HD. We also still get the HD channels from LA (we're in the San FRancisco Bay area and had exemptions to get CBS and ABC from LA). I've spent a couple of hours on the phone with Tech Support and they're sending an email to someone else to check it out, but so far nothing. We have had some cloudy weather, but not for the past 24 hours and still no change. We both had Christmas lights installed on our roofs, but that was 10 days before the issue. Any ideas out there? Directv just says they'll send someone out in a week, but I don't understand why one of my HD DVRs would work and two not if its the dish/wiring. Would appreciate any advice.