Instruct: Classify Amazon reviews into positive or negative sentiment
Query: What a piece of crap-Don't buy !!!!

I have had three, count them, three of these locks change their combination's enough "on their own" that I am not able to get in. I suspect this happens when someone opens or closes it, but this is NOT a single event. 3 Times in one year, three different locks.And Master Lock is no help at all. I told them I'd send them the lock, they can keep whatever is in it (for security reasons) but no, they just want to sell a new lock.Do not buy this piece of crap.