Nosedive with Pixhawk - Help reviewing log?

Hello all, New to Pixhawk! 

After a dozen successful flights I was flying my plane at an altitude of around 250-300m when my RSSI dropped and the plane went RTH. I've tested the RTH plenty of times succesfully but this time it went into an extremely steep nose-dive with throttle maxed for the duration. it levelled out at 100m and i regained control.

Is it simply the case that the pixhawk will agressively go to the target RTL altitude or is there something else at play here? I notice that (according to the google KML, It goes back to FBWA and is still diving)


My plane is a Volantex Ranger so it's not exactly a sporty plane so doing near vertical nose-dives is way outside it's comfort zone!

My channel mapping is as follows:

CH1 - Aileron
CH2 - Elevator
CH3 - Throttle
CH4 - Rudder
CH5 - Flight Mode
CH8 - ezuhf Link strength

Dataflash log zipped & uploaded here (due to 7mb filesize limit on forum)

http://beta.stgregorys.org.uk/467-23-20165-04-18PM.zip

Any help would be greatly received as I'm a bit scared to fly it till I know its safe! Thanks :)

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