Cold: Dansby Swanson
Swanson is going through a rough stretch right now. In his last 30 games, the Cubs' starting shortstop is hitting just .183 with 31 strikeouts and only 3 home runs. It's not fun to watch one of your cornerstones go through this kind of slump, but it shouldn't be unexpected for a guy like Swanson.
This is exactly how Swanson has performed throughout his career, periodically going through red-hot stretches at the plate followed by long slumps. That isn't to say that we should be calling for Swanson's head, because the team absolutely made the right call by signing him this offseason. He is an experienced veteran, a leader in the clubhouse and one of the best defenders in the game right now.
It could be a blessing in disguise that Swanson's bat is cold right now since other guys are picking up the team and Swanson could get hot right when the playoffs are starting.