Something clearly broke after the first Chelsea game. Sure, other teams have 'figured us out' in the meantime but I feel there's more to it. Before that, everything was going our way, even when we weren't playing particularly well. Since then, there's been less movement off the ball and there's a spring missing in the step of a few players.
When you look at the bigger picture, it's not all bad though. Getting into the top 6 in the first year of a new cycle and without arguably the best striker in the world is nothing to be sniffed at. I'd say the only problem is a general downward trend and the fact that Postecoglou has seemed a bit slow in addressing the issues. The summer break will probably do the squad a lot of good and if the new signings show the same level of enthusiasm as the rest of the squad did in August, next season could be even better.
That said, last night's match was absolutely terrible - on a par with some of the worst these last few seasons. Also, I'm annoyed because a friend who's quite fond of statistics told me in December that we would nose-dive in the second part of the season and a) I dismissed his opinion and b) I don't like stats, particularly when they prove to be correct.