Bean Door Handle Threads Wear Issue

I recently ran into an issue with my door handle where the handle would loosen during the roast and when I go to dump the beans I have to re-screw the handle back into the door. After a couple weeks of this and even swapping out the threaded rod now the handle feels loose and I’m not able to tighten it down into the door at all. I can’t see any stripping on the threads in the door but the handle threads are brand new so I’m not sure what’s going on.

Basically, it just kind of hangs on during the roast and I’m not sure if I need to replace the door assembly itself. Any and all helpe appreciated!