Interference with GPS

What interference in a 2010 Toyota Highlander Limited could interfere with my Garmin nuvi 760 getting the satellite signals.
Have had the SUV for only 2 1/2 days & had no problems until today. The GPS "lost" & then re-acquired the satellite signal 3 times in a 10 mile trip. Then on the return trip, it lost the signal again almost immediately & could not re-acquire it.
The GPS was located on the center front edge of the dashboard just over the monitor for the back-up camera. When I pushed the GPS back only about 2 inches towards the windshield, it almost immediately re-acquired the satellite signals.
The SUV does have a compass in the rear-view mirror which would have been almost directly above the GPS in it's initial position.
Have had the SUV for only 2 1/2 days & had no problems until today. The GPS "lost" & then re-acquired the satellite signal 3 times in a 10 mile trip. Then on the return trip, it lost the signal again almost immediately & could not re-acquire it.
The GPS was located on the center front edge of the dashboard just over the monitor for the back-up camera. When I pushed the GPS back only about 2 inches towards the windshield, it almost immediately re-acquired the satellite signals.
The SUV does have a compass in the rear-view mirror which would have been almost directly above the GPS in it's initial position.
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Comments
GPS works great all of the time when out of the Highlander or in another car.
But still can't pinpoint exactly why the interferece is occurring.
I certainly don't want to have to use a GPS antenna.