I Myself have 4 teams, so i have already seen a lot of things.

In my opinion what happens is that If you have a strong team fighting for top 4, you get trolled to keep the LEAGUE more competitive, If you are fighting for promotion you Will win against some of the stronguest teams and lose against some of the weaker ones.

If you start to stop watching games and training, the system recognise this as a possible situation of abandoned the game, so it gives you good results, for you do not quit.