Mission Problems APM 2.6 & 3DR GPS

HI All

Been having some issues with missions, some are reliable others not only 15 to 30 way points.

Issue is when auto invoked the Octa will fly to first way point and then turn and make its next leg run and starts losing altitude and heading, I flew a mission without issue in my Town without issue, then went to another town 60km away and got the issue so unreliable I could not trust it.

Ran the compass calibration twice to see if this would help. ( very difficult with 22,000mah batteries ) 

Tested manual way points (5), tested okay. did it again an hour later & drifting and lsoing altitude problem

Would anyone have any clues

Had an ldop of 1.7 to 1.8 (10 to 11 Satellites), mostly defaults for mission 5m/s etc.

I have a log if someone can help me as I have tried to deduce the results but inexperienced with them

Other details Tarot x8 frame, dualsky 5010 motors and X-rotor esc's

Much appreciated if someone could assist me at least understand what this intermittant problem could be.

The weird thing is I could go out now and it would probably fly a mission without any issues

Cheers

Phil

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