IPhone 4s won't sync to itunes saying I have to authorize my PC when it's already authorized.

I bought a used iPhone 4s and I haven't synced my phone to iTunes since i bought it and i was trying to do so yesterday and it kept telling me that I can't sync my phone because of some purchases on the phone and that i have to authorize my computer to be able to sync it but my laptop is already authorized.
P.S.
- the technician restored my phone and used a different apple ID to set it up but I signed out from it and used mine as soon as I got my phone and I kept some apps from that apple ID on my phone.
- also, I updated my phone to 7.0.3 just recently (I dunnot if this is happening because of these two things)

Rome,
I would try everything that "Diesel" has suggested !!!
I had the same problem after updating to iOS 5.1. I was never able to fix it. I did however find a work around and that was to delete the offending Wi-Fi configuration and then under "Other" manually add back my Wi-Fi connection. This solved the auto re-connect problem. I don't think this is a fix but a pretty darn good work-around.
I talked to Apple about this problem while arranging for a replacement phone (for another problem) and the Technician seemed to be aware of this quirk and suggested that my fix was about the best I could expect.
HOWEVER - when I received my replacement phone not only did the problem that I exchanged the phone for now function correctly but the "Auto-reconnect" of the Wi-Fi worked as expected and as it did prior to the iOS 5.1 update.
Go-Figure !!!

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