Edge 1000 Glonass problem

Turned on the edge 1000 and the satellites were found no problem.  The problem came when I went inside a shop for half an hour and the satellites were lost, I then went outside and the edge 1000 wouldn't find the satellites.  I switched to GPS only and the satellites were found, I then switched to GPS+GLONASS and the satellites were lost again.

Do I have corrupt files and I need to reset or is something to do with a problem with GPS and GLONASS setting on the Edge 1000.