Board:
CPU: PIC32MX795F512H - 32bit MIPS core, 80MHz, 128kb RAM, 512kb FLASH
ACC+GYRO: MPU6050 (I2C),
MAG: HMC5983(SPI),
BARO: MS5611-01BA03,
GPS: NV08C-CSM ( GPS/GLONASS/GALLILEO differental receiver, resolution altitude/attitude about 1m) .
All Sensors axis on the board are at the same direction. MPU6050 placed in center of the board.
Frame: DJI F450 (ESC + Motors+Proppelers)
Copter flips when i try to tune one axis on a string (PITCH ), and slow moving to positive direction of ROLL axis when try to tune ROLL. If i enable ROLL and PITH (set P greater than 0.1 and I gretater than 0), copter is unstable

Even, if all P = 0.1 and all I = 0 copter slowly flips over PITCH axis: Front motors are slowly increase THROTTLE.
I can write a video multiwii conf gui and copter on a string if it needed.