Every team has a time they will lose form and by that time they are going to drop points. I think it's what's happening to Chelsea currently. It's very difficult to stay perfect all season. It was only Arsenal that were able to achieve this, during their invincible season under Arsene Winger. I think Chelsea dip of form is still going to continue for a while. They are playing Bournemouth tomorrow, although they are playing from home which should serve as an extra motivation for them. But Bournemouth is not an easy side to defeat. So Chelsea fans should not expect that their team is going to get 3 points tomorrow. Bournemouth is going to break the heart of Chelsea fans because their team is going through a lot right now.
Yes, that happened to Manchester City this season, they lost a lot of points in previous matches and now they seem to have found their best form again. Team instability is certainly very difficult to predict because when their pace is good but when they lose once then it could continue in the next matches. For that, a coach who has a lot of strategies will find it easy to restore the team's strength and also the support of all players to perform better will be able to bring them back to victory.
Chelsea has shown good development, but they need to maintain the stability of their performance so as not to lose points again. I think Chelsea's target is to secure a ticket to the Champions League next season because to compete to become champions it seems their mentality is not strong enough. But who knows if they can quickly get back to winning streaks of course their chances of becoming champions are very big because the season still has many matches left.