Lost stabilization, could barely control in manual mode - Log attached

ArduPlane Plane 4.5
1

Could you please help me?

Model is AR wing PRO, i fly it without problem…untill today.

On the third part of the flight, the plane was loitering.
It started drifiting down and left and reached around 150-180 km/h.

I switched to manual mode and slowly decelerated. But the plane was responding wrong.
Rolling produced an erratic movement and pitch also.

I was able to slowly come down and landed as i could in a near field (No damages, but i was lucky!)

What happened?
I had a look at the log, i can see something is wrong. But i am not so into it to understand what.

Here is the log: Unique Download Link | WeTransfer

2

Additional information: i thought i lost use of an elevon.
They seems good after inspection, and servos working well even under load.

I can not understand why i was not able to pilot even in manual mode.

Video footage of erratic loitering: https://youtu.be/cMKFCUS6VAI

3

The log file is not available.

4

Log erratic flight

Flight log from previous flight

5

Servo channel 2 pegs at 1100 before things go wrong in loiter.
So I’d say you lost your right elevon.

6

I will check again, to me it works. But of course…not.
Thank you mate!

7

Check for an intermittent problem; maybe a loose servo connection, or flaky servo.
I’ve seen a similar problem with damaged servo gears too (broken teeth can result in somewhat random behavior).

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8

Thank you Mark!

I am suspicious about wing connection connector.
When wing is under load, they may detach.

I have seen this in slope gliders using the green multiplex wing connectors.

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