BB Z10 reboot issue

Hi,

I have had my Z10 now for about 2 months. Totally rocks except that it reboots randomly. It especially reboots in MAPS using navigation after about 5 minutes of driving. So far I have done this:

1. removed sim and battery
2. removed all the apps I downloaded
3. Applied latest patches.
4. I have now even put on the leaked 10.1.0.1627. This one is much more stable but still reboots in MAPS after 5 minutes or so of use.

Any tips before I look to RMA this device ?

Thanks.