Often when cutting off larger thicker steel with an abrasive (made for steel) 14" cut off the sparks and cutting stop and the steel gets hot.

I can detect the the "blade" is hot but only for a very short time.

Even after the blade and steel cool several min. it will not cut unless I wait for a long period of time, about an hour it will cut again.

I know the problem is the blade cause if I put in a fresh blade I can cut immediately.

What is going on?

going to go try to finish the cut in a 3/16" x4"