GPS Failure while PID tuning

[altshuler]

Hello
I have Intel Aero RTF.
PX4 version - v1.9.0-rc
For a while facing some Z position floating.
When I tried to solve this issue I tuned Z velocity and position PID.
While changing MPC_Z_P to 2.0 vehicle suddenly lost GPS readings, switched to altitude mode, started flying aside and than failed. Anybody see any problem ?
Here attached flight log.

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[julianoes]

Sorry for the late response. Did you ever get to the bottom of this?

[altshuler]

Unfortunately not.
Same issue. Using 1.9.0 release.

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