We're trying to figure out what's causing this error, but it's not easy when the error reads "SOMETHING reinstalled our exception handler..."
Ok, WHAT reinstalled your exception handler?
Anyway, one thing I've noticed is it is looking more and more likely to be associated, in some way, to AI traffic, and possibly some scenery and ground traffic. And possibly all that could be coupled with the TBM's TCAS, which could be why it is isolated to the TBM. Personally, I've never had an exception handler error, but then again, I don't have many plugins installed.
Saso is trying to find out what is causing it and if he finds the problem, it'll be included in the next update, but in the meantime, the only thing we can recommend is removing all plugins (except Gizmo) and reloading the sim and testing. Then add the plugins back, 1 at a time, reloading each time, to see when the error happens again. That'll help us narrow it down.
In your case, I would try removing the XJET plugin first and foremost. Don't uninstall. Just move it to your desktop and try the TBM again. Let us know how you go.