"The crownless again shall be king"
All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
From the ashes a fire shall be woken,
A light from the shadows shall spring;
Renewed shall be blade that was broken,
The crownless again shall be king.
At least two versions of this rumour exist: one says that he cheated on Jelena with a minor Bollywood luminary called Deepika Padukone, the other says that he made the beast with two backs with his son's nanny.
There appears to be precious little evidence for this, so I am not inclined to argue that this is what happened- but it wouldn't surprise me if this is, in fact, the reason for Djokovic's lack of staying power in 2016.