Last season i had a total of 7/8 games in LEAGUE without winning, even against a abandoned team and a full 2* team.

It happens from time to time, your team just dont perform, even against weaker opponents, it is just a matter of time.
This season i am having good results with the same players, since i didnt promote because of the bad results.

I have one team on level 12 and another on level 11, and what i notice is that at this levels the teams are more similar in quality, Making it hard to have always good results.