Hexacopter problem

Please help!
Hexacopter, APM 2.5 Controller 30 Amp esc Simo, 750 Kv motors.
The symptom: 1-2 minutes after take-off during stabilized flight, the right and left tilt, jolt, but kiegyenljti. I attach the logs. If anyone can help me some advice, thank you. Have I changed engines regulators. The propellers can not shake, flying very smoothly for a while, the phenomenon is not constant.
Regards
Joe

some pictures

https://www.facebook.com/photo.php?fbid=339711222823402&set=pb.205522462908946.-2207520000.1381397927.&type=3&theater

logs.zip

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