EF 70-200mm f/2.8l is ii usm loose glass sound
I purchased EF 70-200mm f/2.8l is ii usm last december. It works fine, but recently during a photo session I noticed a loose glass sound when rotating the lens, from the horizontal to vertical position. I took it in for repair and just got it back with a statement that a problem with something loose in AF system had been fixed. Today I however the noise has reappeared.
Has anyone had a similar problem?