"I think your props are to big.
Try 9x5.
What is the weight of the quad?
What is the battery voltage after 2-3min flight?

For example i'm using "Turnigy Multistar 2814-700Kv 14Pole" motors, 30A TBS bulletproof esc, 4s 4500mAh 35-70C, quad weighs…"

"I also experienced the same thing.
I already formated the SD card and the problem was gone for a few flight.
The one day it repeated, so I took the SD card and deleted all the logs from it.
Had only 4 flights since, but the problem didn't repeat…"