Ok, kind of a weird issue I had. I have a Garmin NUVI 255w and was driving to work when It lost signal for no real good reason. I thought it was a little odd that it took about 10 min to get sat lock again. Afterwork I was driving home and it did the exact same thing at about the same place. Now, I was not near any large buildings or obstructions. I was driving down I90 right past O'hare airport.
Anyway today just to test it I put my NUVI on the dash and next to that I put my Garmin Legend up. Now on the legend you can see the sats and the signal strength of each one. On the NUVI 255w there is no screen for this. I find it odd because my wife's NUVI 350 has one. To make a long story short, as I was driving past O'hare airport again. The NUVI lost sat lock and sure enough my legend all sats went to 0. Not even gray bars like there is no lock. They just went to 0. Just before this I had probably 10 solid locks on sats. I kept driving and as soon as the Legend started to pick up sats again the NUVI came back online.
I drive a 2004 Pontiac Grand Prix so there is no issue with the windshield that I know of that might cause this. Does anyone have any idea what might be causing this?