Lag on PC

i have posted about this problem before and i still cannot find a good fix. when i try to play an online mode i have input lag and as the game goes it gets worse and worse ive tried changing all the graphic settings people told me and it improved but did not fix. the most annoying part is that a few days ago it randomly ran perfectly fine for about 2 games and then went to **bleep** again. i have no idea what to do anymore but its ridicules that i cant play the game i spent money on preordering and cant seem to find a soul that works for EA that will even try to help.