Makita 6337D cordless drill problem

Hi there-

I have a drill, a little over a year old (no more warranty), that I haven't used more that about 3 or 4 times. All of a sudden, it stops working. When I pull the trigger, it seems like the drill is snagged on something and there is a distinct buzzing noise just above my left thumb, when holding it. i made sure and recharged the batteries, but the same thing happened. Any ideas? Thanks.

(sorry, no applicable product category)