If you are a company driver you need to get it serviced with your shop. Sounds like an electrical short or configuration issue.
I had the exact same problem with my last truck at Prime. They never did figure out why the truck would do that. It was something causing interference though, because I would lose GPS signal on my Garmin also. They finally put me on another truck, but I heard the old truck has been reassigned and the new driver is still having issues with it. You didn't say who you drive for, but the truck # was 649125.
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I have issue any time I turn the engine key on position with engine runs or not . All gps inside the truck have lost satellite signal. And return when I turn key to off position. Within 2 to 3 minutes.