I m using bb 9900 with 3g bands 1,4,8 from o2 uk . 3g network is working sometimes , and sometimes phone starts to rebooting over and over again . this happens only when 3g network is on , and on the EDGE only, phone works perfectly. i try 3 different software versions ,including the latest leak .267 ... i know this problem is about 3g bands 1,4,8, but can anyone tell me how to resolve this problem???? tnx