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...
The reason for this mishap was very likely the table surface...
This from page 18 in the user manual.
Just in the end of the landing the log shows that the VPS height disappears just before the drone tumbles over the edge of the table... this...