mine is from Singapore Telecom -> v4.2.2.175 (Platform 2.5.0.33) Kernel v3.8.4.47.
The BB unit keep rebooting itself randomly, can be as many as 20 times a day.
The Blackberry support guys told me to disable WIFI totally and see what happen. It is a little irritating as the reason why I get an 8320 is due of the WIFI availability, now I have to take it out (o_O)...
Let see what will happen.