Here's my guess . . . Assuming good blade alignment at 45 degrees (mine was great right out of the box and I'm a picky so-and-so) I wonder if the stock is being fully supported after the cut. If you are ripping something, say 30" or so, there is plenty of the cutoff to hang off the end of the saw thereby tilting the part still on the saw table up and into the blade. If the keeper and the spoil fully supported by an outfeed table or other method to keep it on the same plane as the table?
"A hen is only an egg's way of making another egg".
– Samuel Butler