Door knob failed within 60 days

I was able to install this pretty easy as a replacement for an existing exterior door. I've had the lock for about a month and a half and when someone was leaving this evening the knob came off in their hands. The combination that you program in isn't sequential in any way either. Meaning that anyone can push the numbers in any order to open the door. I'm very dissatisfied with this product and regret my decision to purchase it.

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