New 562 xp. Ten tanks of gas.... I cut 1.5 cords of firewood this morning... Cutting some filthy logs shut saw off to change chain. It won't start...fires up for a second and dies. Over and over. The time I started before I shut it off I pushed the air purge and it had a funny flat spot of a click or pop if that makes any since. I am going to dealer in morning. I had to finished cutting with my 3.5 year old 445. Not happy any ideas till the morning g...