Just from the log analyzer, there's nothing wrong except the crash you mentioned and the motor pwm differences from the average.
Size (kb) 2806.158203125
No of lines 34544
Firmware Version V3.4.6
Firmware Hash e707341b
Free Mem 0
Skipped Lines 0
Test: Autotune = NA -
Test: Brownout = GOOD -
Test: Compass = GOOD - mag_field interference within limits (17.09%)
Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = FAIL - ERR found: CRASH
Test: GPS = GOOD -
Test: IMU Mismatch = GOOD - (Mismatch: 0.27, WARN: 0.75, FAIL: 1.50)
Test: Motor Balance = FAIL - Motor channel averages = [1548, 1458, 1422, 1387, 1377, 1622]
Average motor output = 1469
Difference between min and max motor averages = 245
Test: Parameters = GOOD -
Test: PM = NA -
Test: Pitch/Roll = NA -
Test: Thrust = NA -
Test: VCC = GOOD -
However, when I tried to check for any error from motors or ESC (by having a saturated signal value) I found that there's something really weird with your motor outputs: you have signal from C1, C2, C3, C4, C6 and C8. I was expecting to see a signal from C5, but it's always 0.
Moreover, C8 looks like a reflection of C6 with an offset.
Just in case, could you check your signals from the Pixhawk (without props) to discard a bad wiring or something related?