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Originally Posted by tom.arthur
It seems strange to me that this one device is especially susceptible to RF interference. I would hope that the product would be protected well enough that things like cell phone towers and power lines wouldn't effect it.
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Automotive electrical components would be affected by a lot more than cell phone towers and power lines. Our 2 megawatt radar antenna has caused quite a few air bag warning lamps to illuminate on the dash boards of many Land Rovers and Fords. Enough for FoMoCo to send a team down this way to find out why it was happening! Also, our antenna sweep has stalled two separate Yamaha R1 motorcycles that were at idle.
You can build in lots of shielding around a component to prevent RFI (radio frequency interference), but truth of the matter is there's always going to be something out there that will be powerful enough to bleed through.
As far as the navigation system goes, keep a record of where it keeps resetting. If you notice a pattern, look around and see what large pieces of electronics are nearby.
Or, perhaps the problem is within your vehicle?