My 935 got a 19:10 update on Saturday (from 15:10, worked without any problems up to that date). Today I went for a run first time after the update but the gps accuracy is completely out of the window (We are not talking meters, we are talking hundreds of meters, when it looses accuracy i run house roofs far away, it's on GPS + GLONASS). The watch is still reporting a full GPS signal throughout, . Any ideas?