Fan survey has a large variable and you can it keeps changing all the time. I have 8 wins in a row and it happiness with this season has varied from 4-5 balls. Yes dropping to 4 after my last win. I stopped looking at it some time ago (well I look at it but do not make any desisions on the stuff I see there). I have not changed my players (selling buying) for a month now but the one focusing on transfers is still wobbly and keeps going up and down.
So don't take these surveys too seriously (atleast 1 ball variable) and build up your arena instead.