Coaxial Octocopter Keeps Crashing due to oscillation

Hey guys,

I have a drone that is an octocopter build that flys stable and then suddenly goes crazy. I have looked at the logs but I have no idea why it randomly goes unstable and crashes. Logs: https://review.px4.io/plot_app?log=919f177a-5f27-49f9-88e1-cf0deff149a3. Please let me know what to do.