I have a 5 month old SGS running stock, unrooted, Froyo 2.2. Up until yesterday it was working fine here at the office. Now, while at the office I cannot lock on or maintain a 3G/HSPA mobile network connection. The odd thing is that if I walk down the street a bit, I can get a lock (may have to cycle packet data option to get it though). A co-worker with an iPhone that sits one aisle over from me, who is also with the same carrier, has no issues getting a mobile network lock. I've reseated the sim and external microSD card and there is no change. It seems to work fine everywhere else I go, just not here at the office. Any ideas?