I went to pick it up yesterday. Nothing was wrong. They had my car at the workshop for over a week running tests and didn't find any issues. The explanation they gave me was that probably some sensor detected something weird and put the engine in "safe mode" to prevent damage.
They cleared the alert end updated the software, and that was it.
However, after the software update I noticed a couple of new problems while driving on my way home:
1) When I put the car in neutral while driving (maybe stopping at a traffic light or coasting slowly down a slope in the expressway) the car thinks I'm in 1st gear:
YouTube video of the issue
2) The middle center console screen went completely blank a few times: all the indicators between the blue lines disappeared and were replaced by a white/grey "cloud". This went back to normal when stopping the engine and restarting (which I was able to do because I was in a traffic jam on my way back). I don't have any photos or videos of it, but the part that disappeared is everything enclosed in the red circle in this photo:
View attachment 48371
3) When idling, sometimes the engine kept cycling between 1100-1400 RPM for no reason, without me touching the throttle. This may or may not be an issue, but it didn't happen before.
Needless to say, these issues make me a big nervous.