I keep my belt snapped all the time. I've never had the button come unsnapped, even getting in and out of the car and moving the seat back and forth. I'm only 5'6 and the belt doesn't rub on my neck either. It sits right across my shoulder.
I've also noticed threads where people say the headrest pushes their head too far forward. I noticed my head while driving doesn't even sit back against the headrest. Are you guys sitting with the seat straight up? Mine is slightly reclined.
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