HUT - Play with friends mode LAGS

Hi,

About week or two me and my friend we are having about 0,5s lags every few seconds during the game no matter if I host or he hosts. This happening only in HUT/play with friend mode, when i play HUT online modes like classic HUT, Champs. or Wild Card there is NOT A PROBLEM. 

As far as i know this mode is P2P and we are both on optical internet and same ISP in same city and never had this issues before.

Did you guys made any changes which causes this? Or does anybody else having same problem ?

Thanks