Had this issue a few weeks ago after I had unplugged the battery to do some DIY work on the car.
Was driving down the highway 60 mph. Nav screen and odometer went black for a few seconds then everything boot back up again.
Got to my location checked everything under the hood and car started fine.
Driving back home and hit a soft speed bump around 30 mph and everything went blank again for a few seconds before coming back on.
Hitting the bump made me realize where to look and you guessed it....
