I've not had it happen to us. Yet. I've only seen two or three unraveled but it was enough to convince me it can happen. I do not know whether the lock handle was tripped or not. In all cases, the awning unrolled while the arms were still fully attached, upright, to the coach. So strapping those arms doesn't help on this problem although it would keep the arms from falling out should they become unlocked.
I'm seriously considering getting a lock for ours.
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