Default XT883 on Xt862 problems

I flashed the radio on my D3 to XT883 and all was fine(or so I thought). I cannot get the GPS to work properly. I can take the phone back to stock and the GPS works great. Go back to XT883, no GPS. It never sees any sats. I got a second D3 from ebay and I am getting the same issue with it. Anybody got any ideas? Thanks