Yeah ... a plain & simple "Uncommanded descent" case unfortunately. Those have been quite rare lately as from DJI introduced the warning system regarding over revving motors in the firmware.
Looking into your flight a bit & depicting the crucial flight telemetry in graph form below shows ...
...that it in total was 3 major occasions where the Mini descended rapidly without stick commands, have marked those 3 periods with a red ring on the time line.
The red graph shows the height relative the HP, read from the barometric sensor ... the blue graph is the vertical speed reading, positive values mean descent & negative ascents. Lastly the green one tells us how you applied the throttle to regulate the height (throttle = left stick forward or backwards ... forward stick for ascending means positive values).
It's easy to see that in those marked 3 periods you had full left stick forward for ascend command ... but the vertical speed anyway went to big positive values --> the Mini lost height rapidly without you commanding it.
(click on all charts below to make them larger)
View attachment 120794
So why this behavior ...
Representative for "Uncommanded descent" cases have always been motors that can't spin faster as they are already on max RPM. This usually results in a bad ability for the Mini to maintain a proper tilt angle ... which means a very bad heading speed, not at all on par with the specifications for the Mini.
If we check off how the Mini tilts, how the heading speed performance is & how it was commanded by the sticks.
Have here below chosen a period just before you commanded RTH (the light blue background field) ... there you had some full elevator stick commands (full forward on the right stick = blue graph) ... according to the specification for a Mini it should be able to maintain a max tilt angle of 20 degrees in P-mode. Have placed the markers in the chart in a typical place where the elevator command was full ... but the Mini could just produce in average 10 degrees tilt. This is also reflected in the green heading speed graph with a really low speed.
View attachment 120795
This behavior with over revving motors (typically in the rear) leading to low tilt angles & bad heading speeds sooner or later develops to a more critical state where the props no more can generate enough thrust to generate lift either ... which leads to these uncommanded descents.
Usually in events like this a lot of "Not Enough Force/ESC" errors is generated ... & this was the case in your flight also.
Here from the flight log event stream ... at 143,5sec into the flight the first error appeared.
Not Enough Force/ESC Error. Max. Stromleistung des Fluggeräts erreicht. Flughöhe verringern und vorsichtig fliegen. Sollte das Problem weiter bestehen, sofort landen (Code: 30168)
View attachment 120797
All the wind warnings was in reality not true ... those are a result of wrong calculations coming from the bad tilt together with max stick commands ... the wind was in reality manageable, only a couple occasions is noted with gusts up to approx 7m/s.
View attachment 120798
So ... as said earlier, the root cause to all this is flattened or warped props. So see to that you change your props & update the Mini's firmware to the latest together with the DJI Fly app, then you should get warnings if this with deformed props are about to force the motors to go for max RPM again.
If you attach the mobile device DAT log we can out from there pinpoint which prop that was under performing this time ... the correct DAT ends with FLY017.DAT.