Shower unit from Costco.door problem
 

New Waves Shower:
I need advice for my plumber on the New Waves shower that we purchased from Costco
The door seems to sag continuously
I see some other people have had the same problem
We have only used it ab out 3 times , however I am worried that someone might get stuck in it.
Doesn't seem right that we have to replace a shower that is less than 2 years old
Thanks for any advice.
NIce doesn't mean that it works great.

How is the unit secured to the wall?

Please provide pictures.