I cant figure out why my quad is going into RTL mode

Yesterday, I went flying after a rebuild. The quad would fly great for a few minutes, then switch to RTL and attempt to land itself. (I was flying in drift mode) I switched to stabilize and was able to regain control. Once I switched back, the same thing would happen. Ive downloaded the logs and auto analyze says this:

Log File C:/Users/Administrator.BusDev/AppData/Local/Temp/tmpD233.tmp.log
Size (kb) 784.0234375
No of lines 10611
Duration 0:03:49
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 = GOOD -
Test: Compass = GOOD - No MAG data, unable to test mag_field interference

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = FAIL - ERR found: FS_THR
Test: GPS = GOOD -
Test: IMU Mismatch = UNKNOWN - No IMU log data
Test: Parameters = GOOD -
Test: PM = GOOD -
Test: Pitch/Roll = GOOD -
Test: Thrust = GOOD -
Test: VCC = GOOD -

I have re-positioned my antenna which did not help. Errors in Mission Planner state

Err. Failsafe_Radio_1

Err. Failsafe Radio_0

I am using a relatively new Turnigy 9X radio with matching 9ch rx on the quad.

Thanks for the help.

2015-06-17 18-34-34.bin

2015-06-17 18-39-48.bin

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