Arducopter 3.4-rc1 constantly falling abruptly

@Carlcox89 wrote:

I am having serious issues with my copter, in the way that it does fly for a short period and then just descends abruptly hitting the ground. As soon as I see it descending (usually i'm flying at 2~3m above ground because I'm trying to find the cause of this problem) I switch to stabilize and cut throttle to avoid major damage.
At first I thought this is was a temperature related issue, but now I dont think so.
I saw a log that contained barometer error in the exact moment the temperature rised to 70º degree inside the frame (it's an waterproof one) but now logs dont even show any error, the copter just falls to the ground...
Would appreciate very much if someone is able to help me figure this out

I'm using 3.4 rc-1 now but this issue was happening with 3.2.1 too

logs:
https://dl.dropboxusercontent.com/u/6083727/20160530150115.bin
https://dl.dropboxusercontent.com/u/6083727/20160530153403.bin

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