"We're clearly not firing on all cylinders at the moment," Terry said.
"I think we've got another gear to go, which is still encouraging, being the position we are at the minute.
"So we're not too disappointed, we just know as a group we can get better.
"It's not only us who have suffered defeats and draws against teams where you would expect us to win. Hopefully we can knock that out of our system sooner rather than later while other teams are still struggling.
"Manchester United are still struggling, Cardiff beat Man City, there's been all sorts of results that have been big upsets.
"It's important like (against Palace), even though you're grinding it out and it's difficult, you have to see those games out."
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