Most of the CTD's I've seen appear to be scenery based. And they happen because the G1000 is reading the terrain, and if the scenery file is faulty, it crashes. Sometimes it doesn't have to be faulty. Scenery can be spread across more than 1 partition, and again, it'll crash. I've also seen a LOT of airport scenery plug ins tied to the actual scenery, outside of the resources/plugins folder. The plug ins are in the actual scenery folder. These can also, very easily, cause CTD's.
So far, on my end, I haven't been able to reproduce a single CTD. But then again, I have very few plug ins. We're still investigating.
Unfortunately, there is no way to roll back to a previous version of the TBM.