Shades of Klopps last season with Dortmund when they pretty much imploaded.
After 3 to 4 years of absolutely pushing players to their limits and probably beyond, injuries, tiredness and poor form have caught up with them.
Playing a core team of 15 players for almost every league and champions League games 3 years straight is eventually going to catch up with you and they just do not have quality backups and when 7 or 8 of the core players are injured, tired or just in poor form the whole system collapses