[M0TTE]

Hi, i have a factory unlocked Iphone 3GS. After upgrading from 3.1 to 3.12 and BB 05.11.07 i have problems with my phone. I made a JB with blackrain an after a couple of minutes or hours the phone is simply no longer able to make calls. The eplus logo is still active but i dont have any bars for the signal strengh. Even if i go outside where i usually have a signal nothing happens. The only way it to reeboot the phone. I noticed that if i disable 3G i do not have these problems. I also tried the devteam JB with pawnage tool, same problem. My brother is haas a 3GS without JB also on eplus and does not have any problems. Anyone knows this Problems and has an idea or even a solution ?