It may actually hits the glass panel wall or curb when you open or close the door.
Glass shower door hinge slipping.
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Like the sticking door the answer to a sagging door is to tighten the screws.
Tempered glass is tough but not indestructable.
The hinge can slide down over time so loosening adjusting and tightening can solve the problem.
Rehang the door but use thin double sided carpet tape to fasten the gasket to the glass.
Take the door off the hinges.
Turn the screws counterclockwise so that they are loose but do not remove them.
Remove the back gaskets.
The door begins to slip out of the hinge at the top.
Find the screws that connect the glass door to the frame at the hinges.
You could try making a bushing as you described a piece of teflon would be ideal.
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This should have zero slip.
Clean the glass if there is dirt or scum.
You could also let the door sag and then shim out the bottom hinge from where it attaches to the wall without seeing the construction i don t know if this is possible.