Did they change something or I'm just unlucky??

[Alexinho]

Guys, It's not exclusively about the stats or the entire formation. (I have already given the big picture.)
I have played hundreds of matches and tried every combination, so I can understand pretty well what goes wrong, if I lose.
It's only these last days that I noticed something odd happening.
I just want to know if I'm just very unlucky or if the developers have weakened the 3-man-defense.

So, I'm just asking you if you have noticed 3-man-defences concede more goals than normally??
Just a survey, nothing more, nothing less.

[t11_fan]

So, I'm just asking you if you have noticed 3-man-defences concede more goals than normally??

My base formation this season is 352 with 3DC's in defence. I only switch 1 player in the middle of mildfield, so sometimes i play 3142 or 3412, but point is that my team is now 2nd just because leader has better goal difference. I think I wouldn't be there if my defence was ineffective. Team's quallity is 5*

I'd suggest you to check form of your players. Try to change their position or put on bench players which are in bad form.
For example I've noticed that sometimes DC-DMC has bad performances on DMC, so I put him on DC until his form became constant and then put him back on DMC. It worked.