I own a BB 8300 and I've experienced some annoying problems with it. It suddenly restarts, at totally random moments of time (during a call, while playing music, navigating in the phone's menu).
I've tried:
- rewriting phone's OS
- wiping the device
- putting the battery out and let it out for 1 hour or more
- using the phone without the SIM
I didn't installed anything on the device. It had this issue from the first minute of usage.
Definitely take back. I had that problem with my 8800 and the replacement device never rebooted. I also don't have this issue on my 8300. In fact, my Curve is one of the "perfect" ones!