Always get the same Auto Analysis errors

Why does my Pixhawk always fail the Brownout and PM test when I run Auto Analysis? Log file attached.

Here are the test results from the LogAnalyzer window:

Log File C:/Program Files (x86)/Mission Planner/logs/QUADROTOR/1/2015-09-07 12-58-30.log
Size (kb) 3944.1044921875
No of lines 52697
Duration 0:03:43
Vehicletype ArduCopter
Firmware Version V3.2.1
Firmware Hash 36b405fb
Hardware Type
Free Mem 0
Skipped Lines 0

Test: Autotune = UNKNOWN - No ATUN log data
Test: Balance/Twist = GOOD -
Test: Brownout = FAIL - Truncated Log? Ends while armed at altitude 3.73m
Test: Compass = GOOD - mag_field interference within limits (2.49%)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = GOOD -
Test: GPS = WARN - Min satellites: 6, Max HDop: 3.47
Test: IMU Mismatch = GOOD - (Mismatch: 0.39, WARN: 0.75, FAIL: 1.50)
Test: Parameters = GOOD -
Test: PM = FAIL - 22 slow loop lines found, max 10.40% on line 1208
Test: Pitch/Roll = GOOD -
Test: Thrust = GOOD -
Test: VCC = GOOD -

Mission Planner 1.3.31 build 1.1.5696.33420

If you vehicle is flying and landing properly, you aren’t having a brownout. The issue is that your log files are damaged (truncated). You could try formating the SD card, or try a different one if the problem doesn’t resolve.

Also, make sure you wait a minute or so after disarming before disconnecting the battery. That should ensure the pixhawk has had time to finish writing any outstanding log data.

I’m not sure about the slow-loop PM errors, but I think I have read they are a red-herring and can be ignored.