I do believe you got it! Turns out there was a tiny bit of velcro impeding the sensor. Don't know how all-of-a-sudden it started doing this, but when I removed the velcro everything went back to normal :) All is well now!
Thanks so much!
Livingston
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...