Had the same problem and milked it along for 2 years while I searched and searched to no avail. I finally made the decision to remove the door and installs new door from a company called newline - it’s called a ‘Shub’. Here’s the link.
http://www.newlinebathroom.com/shub-...-bone-c-3.html
Did it a year ago and it works great. I am very happy to know that when I stop, get set up, and go to shower I won’t have to fight with the shower door before I can shower.