Anyone's thumb scroll wheel fall off???

So I've noticed some issues primarily with the middle scroll wheel, like there's a spot where the wheel will stick and cause you to use a slight be more force to actuate it up or down. It's very annoying but I was just dealing with it but now, the horizontal thumb wheel just FELL OFF. I can shove it back in but after a while it just works itself out again. How do you actually fix this?!?

Also the right button being stiff, as addressed by this post, is SUPER annoying. The way my hand naturally rests puts my finger on the right most of the button and clicking it just feels wrong and mushy and I have to consciously move it more to the left of the button to get any sort of satisfying click