ok. i would say the problem is your formation. if you got good opponents they check your league history, see you play always 4-4-2 and they just see that and counter you. the second thing is. i don't know how match-making works. maybe you had a good season so you get good opponents this seasons. last thing i could imagine. you bought strong players but slow trainers. you enemy bought weaker players that improved well and so they came out strong late in season so you lose now.