Arducopter APM 2.6 suddenly drifting midflight and crashing..

Hi,

i am like totally knew to quadcoperts and just finished my diy S500 copter.

I managed to get it built and the apm2.6 flashed with Copter 3.2.1

Yesterday i went to the park to go for a bit of learning flights, just hovering, bit forth and back.. that

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