Motor/Pixhawk Help

Hoping someone on here can help me out, been having some problems with my pixhawk build,

So far I changed esc's, one motor, been thru 3 flight controllers, apm 2.6, pixhawk, then another pixhawk,

Problem, is that, randomly, the quadcopter yaws most times uncontrollably to one direction, randomly.

Issue was noticed originally after trying to auto tune, all auto tunes would fail, and it would fly horribly after, and thats when the yawing started.

I at first thought my apm 2.6 was faulty, replaced that with pixhawk, issue arose again, 

Replaced esc's issue arose again.

Swapped positions of the two rear motors, uncontrollable rotation switched to the other side.

Bought a new motor, took out the motor I assumed was faulty(which was the back left), Everything was great, (It auto tuned successfully)...for about two weeks, then, the rotation happens again, randomly. Thought I finally had it fixed.

Firmwares I've been thru, range from 3.1.5 to 3.3 rc1

My frame is a 650mm sized atg Frame

Motors are turnigy 4225 610kv motors.  link

Ive used 13x5.5 and also 12.3.8 props

https://www.youtube.com/watch?v=_NTT7LpCiNs

The above is some footage I have of it yawing, and me fighting to control it

I was dead set that after all that time and money it was a motor prblm, Could it be that I chose the wrong motor to replace? If so why did it work fine for a while. 

What would you guys suggest? continue swapping motors? or could this be some other problem? 

and if need be, can you guys suggest motors of similar of better performance to my current ones

I got 20-26 mins flight times with a 8000mah 4s battery and hover throttle was just under 50. 

auw was around 2200g

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