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Hi

I build quad using APM2.8 with Arducopter 3.2.1 and using Flysky TH9X transmitter but I found Quadcopter is not responding to transmitter because of which I lost one Quad it just flyaway and crashed two all have almost same issues. 

It takes off nicely but after some time it create problem some times it flips in air and some times it didn't respond to picth or roll throttle.  

I am uploading Flight logs of crashed Quadcopter

Please view it and help me what is problem 

15-09-29_04-52-54.bin

15-09-27_05-04-51_1.bin

15-09-27_05-04-51.bin