occasional uncontrolled yaw

thanks in advance! I have only flown my new build 2 times and both resulted in most of the flight actually pretty stable, good control from inputs. But all of the sudden it would yaw very fast and I had no yaw control and it would crash. on second flight I disabled the onboard compass because it had allot of noise and the external compass was very solid. my build is as follows

tarot 650 sport
tarot 15x5.5 carbon fiber props
px4 3.4.6
dragonlink v3 
sunnysky 4112-320kv
hobbywing xrotor 40A esc
5000mah 6s X 2 (probably going to have to go to only 1 due to weight)

video here of first crash on 5-30-17

video 1

2017-06-05 10-21-53.tlog

2017-06-05 10-25-08.bin

2017-05-30 12-00-19.bin

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