My SIM stopped working, it was 7 yrs old and swapped many time, it must have broke a connection inside. But i am wondering if it was intermittent in the first place. So i haves a new SIM and will report back soon if the problem persists.

Edit: a few weeks later i havent seen this problem since using a new sim. the only connectivity issue i ve seen since is that sometimes the phone behaves normally and i dont get any data until restart. like the 3.5g icon will turn blues and white, but i wont be able to browse or do anything. i first associated this with the foursquare app and it happened once after uninstalling the app.

Edit: Spoke too soon, the problem returned today.