I had exactly the same problem.
My audi (Costco) fixed it by adding a small extension to the tube - I don’t know what it’s called - stabilizer? Tube extension? Tube tail?
I did a Google search and found the picture below, which calls it a “stabilizer bar”.
Whatever it’s called - it fixed my slipping problem instantly, and permanently. I only have it on one of the - the other one doesn’t slip.
You’re ignoring this member’s posts.
