I think I have a new case under investigation.
A new algorithm of the game engine which spot tanking formations and promotes them to win or not to loose.
I 've heard about other cases and I have mine too.
One guess I could do is that in those cases they increase a lot the training bonus factor
You 're active right ? So you have 8% or 10% bonus from daily training.
They could fix the game engine so that this could be no1 factor for a good performance instead the formation/tactics.