We've been stuttering on and off since we beat Watford 6-1. Coutinho got injured a few games after that and we've been a mixed bag since. Some good wins like Stoke and Middlesbrough, and some bad results/performances like today and Sunderland.
My opinion is that the amount of changes we've had to make due to injuries has damaged our fluidity going forward. Firmino and Lallana have been moved around the midfield/frontline, players like Can/Klavan have been in and out of the side, and the likes of Henderson, Matip, Coutinho and Mane have been absent for weeks at a time. When you compare that to before the last international break where we were playing the same side most weeks, you can see that the forced changes have hurt us. Chelsea rarely have any injuries and get to play the same starting XI most weeks, and look where they are.
I still expect a top four finish but we'll need better luck with injuries to do it, because we've struggled to adapt to them so far.