[PLEASE HELP] ppl lag on purpose

[chakuchi]

hello
I play fifa 16 in pc, and I have a problem
when the ball in in my opponent side the game work smoothly
when I get the ball and trey to get close to the gk and score a goal the game became laggy and I cant do a **** until i lose the ball and the game start to be smooth again

iam pretty sure that my opponent lag me on purpose, allot of people doing this

how can i protect my self that my game will work smooth always and block these people ddos or what ever it will be?

thanks