Unstable flight and crash

I was out doing some test flights earlier, and seeing some strange behavior.

Flight flight:


Around 2:15. There is a large twitch on roll, settles out and lands safely.

second flight:


around 4:45. Notice the large spike to the east. This did NOT happen. While flying there was what appeared to be a glitch on roll, resulting in a sharp motion to the west. Once this happened I took manual control and landed safely.

Third flight:


Around 9:55.

Coming in for a landing. Violent roll oscillation starts and ends up crashing into a snow bank.

Any idea what went wrong here? One disturbing theme I have noticed is that the problems seem to occur simultaneously with a logging dropout and a spike in CPU load.

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