One pannier slipped off very easy. The other I had to pull with a lot of force and it seemed to get worse on my road trip to Big Bend, Tx in mid July.
I tugged really, really hard one time and it must have bent the lock because now it slips off as easy as the other. So I think the problem is the shape of the lock mechanism.
Then later I read in the manual, it says to remove pannier, push down first then pull up. Will someone please try this? It's too late for me to try because mine slip off easy now.