A lot of people have had the problem.
Back in about 2002 or so A&E changed their ratchet mechanism to fix the problem and while it helped a lot it didn't eliminate it. A strong enough side wind can still break the ratchet mechanism and let the awning unfurl.
I base that statement on seeing a couple of motor homes that were later than 2005 with awnings that were destroyed. This was in Wyoming a few years ago.
I am using a lock you can make yourself to prevent it.
You can see it HERE