Could still have an older motor in it.
Mine is night and day different tbh. Totally quiet in the rattle department. The original one wasn’t.
Makes you wonder. The replacement is clearly different.
Mine cane undone a few times, no big deal. Tightened by hand and used a tyre lever to help for the last bit. This was on the trail, tightened up properly at home.
I read about this issue before I purchased, most of the Bosch gen 4 reviews mentioned it last summer. tbh it’s annoying, but the bike is so nice to ride that i put up with it.