New build, 20+ flights, possible desync issue?

New frame 500mm Diatone White sheep build, SunnySky 980kV, RCTimer 20A Simon K ecs, Graupner 10x5 props, Pixhawk Mini. I have had over 20+ solid flights, great AutoTuned quad.

The last flight flight out, looked to be a desync issue, can anyone please advise from looking at the log. Thanks

FYI- Mag disturbance from rebar in the sidewalk concrete