Solo Flyaway?

[herc1000]

I experience a solo flyaway about a week ago. Details... Got the solo out wanted to do some low-level flying, a few minutes in the flight at about maybe 8 feet off the ground it lost GPS signal and flew down to the ground, bounce off the ground, starting fly towards the sky, during this time, it is no longer responding to stick controls so I'm hitting the A button which is set for FLY:Manual with no luck, it pickups GPS signal about 150 ft, I hit pause a couple time, no response, I hit RTH no response, then it just nose dives down to earth full throttle, which ended in a big bang! RIP Solo1.. I have attached the Tlogs. Can someone take a look and tell me what went wrong?