I'm the new owner of a 7230 with T-Mobile. I get errors and total system hangs frequently, at least daily, and not always when doing the same function. Usually clicking the wheel will reset the system, but twice I've had to remove the battery to get it to reset. It's not debilitating, but it is annoying. Is this normal for BB's or should I send it back and have it replaced while it's still in the 14-day trial period?