Try to observe for any relation with ongoing constructions and poor performance. Some users have said that it is just a coincidence, but I still have doubts.
I have set a list for the possible causes of a series of poor or unconvincing performances based on what I have observed.
The list so far is as follows.
1. ongoing constructions
2. teams have been programmed to play well with only some particular types of formations
3. wrong orders
4 Nordeus using bad methods
5. other bugs in the game