Mission mode fails (GPS) after 2 waypoints

flight test log 1:

At 2.16.800 [s] the drone lost stopped mission mode end entered in descent, at this point i take the drone in manual mode to land it safely.

Warning message (bottom of flyght review page) say “Position-Control Setpoint-Update failed” and “Failsafe: Descend with land speed” followed by “Failsafe enabled: no global position”.

Power seem to be ok according to the graphs, but GPS noise and Jamming start to drop at 2.11.700 [s].

Seem strange to me that also with other flight, the GPS start to became crazy after 2 waypoints, not at the beginning and not later.

Here a totally Manual flight in the same place just some minutes later, also here GPS jamming drop few times: