This behavior really sounds like something is interfering with the VPS sensor, making the drone constantly believing that something is closer than 0,5m below it... & by that tries to ascend away from it.
The constant descent following a longer...
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I often fly over the bay by my cottage in 10 knot winds or more. I have a little concern in the back of my head, what if a seagull or osprey attack it, what if there's a failure of some sort, I could lose the drone. But if I don't fly, I don't...