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And just to highlight that we are aware of the topic, the description of the status given above is basically correct. Since the re-implementation of vehicles there have been these cases of instability caused by bad physics simulation. Physics and server-side vehicle simulation are quite complicated things, and while over the past 2 years there have been attempts to stabilize the situation, sadly it wasn't completely successful yet. As many players report, it's definitely not a thing of "you will fly into space every day", but it definitely happens in individual cases, and as the video nicely shows, it's something that looks impressive and anyone seeing it will definitely post it on YouTube, once it happens to them. As it understandably in most cases involves the dead of the driver and fellow passengers, it's only a laughing matter at first.
Our engine team is aware of the issue and regularly allocates time into investigations on this to find improvements, as you can imagine this kind of a situation is nothing a programmer likes to see as the result of their work either. Due to the proven complexity of this topic and other work within the engine, we are sadly unable to give an ETA as to when this will be fixed.
As many other things in the game, vehicle simulation is calculated server-side to prevent hackers from abusing them. Sadly it can result in these instabilities in cases of bad connection, that aren't always clearly reproducible. Another aspect are ground collisions, as we've observed cases where vehicles would show irratic behaviour after having wheels added.
That said, we'll provide updates to this topic if anything changes about this status.