My planner quite feeding.

I am planning down 9 pieces of mesquite using my father's planner (I have never used one before) for an urn for his ashes. I started at about 3 inches and I am down to almost 3/4 inch with a goal of 1/2 inch. I changed the blades a couple of days ago and everything was working well until today when it quite feeding. What should I address first with the feeding issue?