Sam Allardyce’s side have thrown away leads in their last two away games at Southampton and Newcastle.
Looking back at Sunday’s 1-1 draw at Newcastle, he said: “We were all a bit deflated because it felt a bit like a loss.
“We ran out of steam at the end. It has happened twice now and we have to address it.
“We get ahead and maybe sit back too much. We will have to look at it again.
“It’s a recurring theme but I’m not sure why.”