What is the matter with Higbee / TE gameplan?

Dude is like the invisible man this year. He was never Kittle or Kelce but he used to get looks, make plays, etc. Now it's like a special occasion if he gets a few balls thrown his way. We're using him like a blocking tight end and from what I've read - he's not great at that. Maybe he's playing hurt, on his way out. I dunno?