GPS no longer working and Silent Switch malfunction on new 3GS

Hello, wondering if anyone else has experienced this.
My GPS can no longer get a lock on me, it used to work fantastic. It only uses network triangulation now and can never find a satellite.
In areas where it has gotten a solid lock before, it no longer can get a lock. These areas are free of obstructions like trees, buildings, etc. A clear view of the sky, Ive even tried in the middle of an empty parking lot. It seems to me that the GPS is not functioning, yet when its on the battery drains (normally, as it does using the GPS) and the handset gets warm (not hot, Im aware it gets warm).
My GPS used to work flawlessly, I used it to navigate several times with good results. Now it can barely find me on a map, let alone pinpoint me. I installed an app called Motion X GPS which I had planned to use for hiking purposes, I am going to try uninstalling that app and see what it does to the GPS, but I have a feeling it was like this before I installed this app for a short while and just didnt take serious notice.
Should I try a restore - which I hesitate to do - or just bring it in to the Apple store. I hesitate to do that too because I have a 3GS with a nice white screen and Im afraid Ill get one of the yellow tinted ones.

Thanks Phil, funny I actually hadn't thought of that for some reason, This is my 3rd iPhone (2g, 3g, 3gs) and Im usually pretty good about that. This is the first real trouble I ran into with any of them and somehow forgot to do that.
I did it, and it seems better. It still doesnt get a 100% solid lock on me but the blue circle is much narrower now. The app Motion X GPS actually has a GPS satellite signal strength meter on it, and it is now showing 3 bars (still in the red, listed as "weak signal) out of 7 or 8 whereas before it didnt show any. So its an improvement.
Im going to try a restore tonight. I think now I feel it is not hardware related, so feel better about that.
Thanks!

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