Waiting for Satellites

While using my 5800 with my 4700 base today, all I got was "waiting for Satellites" and never got fixed. I checked the satellites and both rover and base had 7 and both were receiving L1 & L2. I also have a NetRS set up at home but I was afraid it was out of range. I tried it anyway and with it as the base, I got fixed with the 5800 right-a-way. The 4700 has worked well in the past. Any ideas? I also tried my 4800 rover with my 4700 as the base and it worked. I also tried the 5800 with the 4800 as base and it didn't work. So the 5800 doesn't work with the 4700 or 4800 but works with the NetRS. But it used to work with all three.

Tom