Well, we all have faced at some point what you are getting through presently. I have every second season a potential treble winning side. And I lost it most of the times. But now, I know it is possible to win it. And potentially, in a season you do not expect it very much. There are tons of people who experienced what you did. Once I had a team 2 stars above the rest and I won 2 games out of the first ten in league. Before starting a 16 game winning streak without changing a thing and I won the league by 14 pts. Take it with philosophy. This week-end, I did not play at all and won all my games, without training bonus, without win bonus, without coaching, without replacing my injured or booked players. I think my opponent must be mad at this. But it also happened to me the other way round !
Maybe Nordeus do not like "perfect" teams with everything at max. I always keep a couple of players on average morale. Just to make sure. And very rarely put my win bonus at max (only for 1/2 or finals in cups).
While I'm sceptical of this kind of hidden effects, I'm also superstitious enough to actually do this. I'm playing one of my best seasons (in the league) and I've had a few players always with only "very good" morale, first just to save blue packs, but now consciously leaving them just in case. And my win bonus at half. My only loss and 1 draw (of 4) came when I maxed the win bonus.
16 League: 8 First, 6 Seconds, 6 in a row
13 Champ: 4 First, 2 Second, 1 Third.
14 Cup: 4 First, 1 Second, 2 Third.
Triple Crown: 1