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Quad is unstable in GPS only and switches unexpected to failsafe and land mode

@Tam_Amaruk wrote:

Hi there,

I got a APM 2.6 flashed with latest copter firmware.

When not in any GPS-envolved mode everything is just fine.
But when I activate any mode that uses GPS (e.g. PosHold) there are several strange behaviours.
I wonder if anyone had similar problems and is able to show me the right direction.

The unexpected behaviour is:
- Position is not hold, but Quad kind of "circles" around the PosHold-Point in a spiral.
- Telemetry kind of freezes during transmission (seen in MissionPlanner)
- some time during the test-flight the FAILSAFE gets automatically activated.
It is not configured or activated in any way. There is also no indication why
failsafe would activate (e.g. RSSI > 20%).
- the LAND mode gets activated unexpected and untriggered.
- the APM cannot be disarmed but wil instead flip over (after already landed safetly)

If need be I can upload a TLOG somewhere.

Greets
Tam

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