Fall down at stabilized mode

Dear friends,

I am a beginner and using pixhawk 2.4.8 for my quadcopter. In stabilized mode the drone suddenly goes up and down. When I raise the roll, drone lands automatically. kindly help me on this. My drone arm is different. it has 45 degrees angle upward direction to the frame. Here i had pin my drone testing video in link

password: 1234

No of lines 2222

Duration 0:00:01

Vehicletype ArduCopter

Firmware Version VDD_5V_PERIPH_nO

Firmware Hash 34e8e02c

Hardware Type

Free Mem 0

Skipped Lines 167

Test: Autotune = UNKNOWN - No ATUN log data

Test: Brownout = GOOD -

Test: Compass = WARN - WARN: Large compass offset params (X:306.97, Y:-81.97, Z:236.29)

WARN: Large compass offset in MAG data (X:306.00, Y:-81.00, Z:236.00)

Moderate change in mag_field (26.99%)

Test: Dupe Log Data = GOOD -

Test: Empty = FAIL - Empty log? Throttle never above 20%

Test: Event/Failsafe = GOOD -

Test: GPS = GOOD -

Test: IMU Mismatch = NA -

Test: Motor Balance = UNKNOWN - ‘QUAD/X’

Test: NaNs = FAIL - Found NaN in CTUN.TAlt

Found NaN in CTUN.DSAlt

Test: OpticalFlow = FAIL - ‘FLOW_FXSCALER’ not found

Test: Parameters = FAIL - ‘MAG_ENABLE’ not found

Test: PM = UNKNOWN - No PM log data

Test: Pitch/Roll = GOOD -

Test: Thrust = GOOD -

Post a link to the .bin flight log from the Flight Controller. Those messages generated from Auto Analysis are useless. That configuration looks very inefficient.

Link to the the .bin flight log from the flight controller

password: 1234

That craft is woefully lacking in thrust. Motor outputs maxed out.

And the battery is sagging to 8V.

Not sure what you are trying to accomplish with the arms and motors at a 45° angle.