Hello there,
Who did you buy it from and how long ago?
I work for a large PC dealer and depending on the circumstances we will just RX (send back to PC, or any company) a product we think is a lemon. Sometimes you just get a bad product that cannot be fixed. This happened to me recently on a PC flooring nailer that was blowing seals. Twice to the repair center, no better. I just replaced it with a new one (out of warranty) and the new one is fine. Same with a Milwaukee Sawzall recently. Repair center said it was fine, I knew it wasn't, guy got a new Sawzall 4 months out of warranty. In both cases I knew both customers, they buy all their tools from me, so I knew it was the tool and not the guy. It really pays to buy your tools from the local guy, not for eight bucks less on Amazon.
Depending on where you bought it from, just take it back for a new one, in or out of warranty. The local mom and pop will be more inclined to do this as they can and will be more creative with warranty issues than the high school kid at the local Borg who does not have a vested interest in keeping a customer.
David, who should not be saying this in public...