Searching for signal 771 code

Just recently our DirectTv has started getting very bad reception and the Searching for Signal 771 code is showing on all of our channels. It appears to get better at night, but this is annoying. What do you think could be causing this to just start happening?

I performed a signal strength test and these are the results:

Tuner 1

1-8        0    73   41   88   47   97    0   69

9-16     82   72   70   78   47   48   23   23

17-24   91   73   46   79   47   67   47   93

25-32   23   93    0   71   23   48   69   73

Tuner 2

1-8       84   73   69   66   94   72   67   72

9-16     71   73   71   81   94   97   70   72

17-24   70   98   94   83   23   92   70   97

25-32   94   97   93   95   70   72   46   73

Thanks,

Greg