Going fast enough to loose GPS signal?

[Thermobaric]

Had a weird thing recently when in Germany. Making use of the autobahns in a 2007 BMW E93 with iDrive with Pro nav. Going quite fast obviously and the signal would drop out and put the location somewhere not on the road. I wondered if perhaps the road been moved hence not matching up with the map or indeed the signal was affected due to the speed. Just a hiccup on the iDrive? Anyone else encountered this?