Single cylinder deadbolt unlocks itself randomly : Locksmith


We have two deadbolts on our door, both single cylinder. One of them unlocks itself randomly. I have heard it happen randomly at any time from inside the house and can not explain why it happens? We have come home before only to find one lock locked. It has happened for over a year. We have an alarm system, cameras, but nothing abnormal. Any ideas why this could happen?



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