You have a lot going on by way of plugins and scenery, and my first guess would be you are getting crashes with corrupted scenery and the TBM trying to read corrupted terrain data. Do these crashes happen in any other areas? If not, can you try doing the same flights with the custom scenery removed, to test what would happen?
To really eliminate the possibility of the TBM being the cause, could you try installing a clean copy of X-Plane, with no scenery and no plugins, and just the TBM, and then checking for crashes? If no crashes happen, try installing the scenery and plugins 1 or 2 at a time, and re-test.