Picked up our new 2025 370FB a couple weeks ago, the hundred mile trip from the dealer to our RV Park found the shower door handle on the floor, was happy that there was no other damage to the doors. This is a familiar problem to me, as same assembly methods were used on my past Montana's. What I had, and have done was to remove the set screw, re-drill and tap a deeper hole, to allow a SS screw to be installed thru the manufactured hole in the glass door, and into the plastic door retainer. This secures it well to the door and stiffens up that whole assembly. But.... As for those plastic door retainers, they don't hold up well, crack, even this brand new one was split, waiting on a replacement....