Just a thought also, if you purchased the drill 2 yrs ago it is more than likely still under warranty. Milwaukee tools have date codes so if you don't have your receipt they could use the date code tag if readable. I have many Milwaukee tools and only had a couple of issues with any of them. 1 was a trigger problem as well and Milwaukee repaired them free of charge. That particular drill, I had bought refurbished and never worked when I received it, but the local repair shop took it in and repaired it free including parts and labor within 2 days.
Best of luck to ya!