I went out to cut today in the frigid temps on some green tree lengths. After a half hour, my saw was pulling to the right something wicked. I stopped pretty quick. The chain is new and I don't think it hit the ground at all, but even if it did, would that cause the big pull to the right? I also flipped the bar around to see if that helped and it did not. Newbie here, so please take it easy on me if this is an easy answer. I'm cutting with a Stihl MS 310.