You are bowing the blade,SLOW down your pushing too hard ,the blade must be able to catch up with the cut (cut a piece of scrap ,saw in make a 2' circle ,make the shape like a golf ball on a tee as you go to exit out the edge watch what cuts through first ,the top the rest is a bow and must catch up to exit smoothly,then look at your cut out will it slide out boths side or just one ,then look at the cut piece see any taper ,which way is it and where is it worse , the exiting at the edge gives you a grafic ,if you just break through the edge at the top ,stop the saw loosen blade clamps top and bottom remove the work piece with the blade still in place you will see what I am talking about ,now look to see if there is also some side bend ,from side pushing ! This is all part of letting your blade clear all the saw dust out of the kerf before oroceeding .smaller thinner blads are worse ,bigger thocker blade in thicker wood are more problematic