Hovering and then going crazy (in a bad way)

[pdmart]

Hey all. I recently received a CF 2.0 and have been very happy and impressed with it. I've been flying it around, and it flies and hovers like a dream. Recently, however, it seems that about 30 seconds into my flight time there are small bobbles and then the entire quadrotor flips upside down and slams into the floor. Has anyone experienced this? Sometimes I'll even take my hands off my controller (iOS app) and the quad will still be throttling into the ground until I pick it up and manually turn it off. Could I have a faulty motor? RF interference of some kind? Any thoughts would be greatly appreciated, as I'm about to order a dozen more of these for research.

Thanks!

Update:
Now it appears LED1 will sometimes flash 5 times and then stop, and the quad is not controllable at all. The console gives the following error message regarding an I2C device:

I2CDEV: Error callback nr: 1024

From reading on this forum, it sounds like this is likely due to faulty soldering of the barometer, and this perhaps caused my earlier problems as well. Could someone from Bitcraze please advise? Thanks.

[tobias]

I've sent you a PM.