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Flying an APM 2.8 board, setup a waypoint flight using Mission Planner.  Set altitude of all waypoints to 100M.  

Flew two missions.  The first mission went perfectly.  The second, with more waypoints had a problem in that after waypoint 5, the quad just started falling in altitude.  The GPS and altimeter showed the altitude drop.  

The flight was near sea level, with VERIFY ALTITUDE checked in MP.

The .bin log is attached.

Please help.