WiFi/3G issue

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http://forum.xda-developers.com – Hello I have finally decide to post about this problem because i have tried several things to fix it but cant isolate the problem. Everytime im at home i use WiFi, not 3G. The problem happens when i go out of my house after several hours of being at home, and the problem is that, i can call, but i have no 3g signal and i have to put the phone on airplane mode on and off. The weird thing is that this doesnt happen at my working building. The WiFi at home is protected with a wpa2 pass. Things i have tried to fix this: Install new ROM (deleting cache system sd card dalviak), original aosp, (HowTos)