I have been having some mysterious problems where the copter stops mid waypoint flight at no particular waypoint. there are no errors and I am unable to re-instigate the waypoint flight manually.
it is random where it happens during the waypoint flight. and aftger I land I can re read all the waypoints back into Koptertools OSD so they have not been lost from volatile ram. no errors in flight log.

as anyone had this problem before?

I have navi 2.2 and FC 2.0 with gps 3.201
firmware is 2.12

I have been flying this setup for over 1 year with thousands of flights using waypoints and never had this problem until today. first 4 flight OK, last four flight had this problem.

help please