Losing in pvp due to lag

It's terrible when you or your teammate d/cs from the match.
i've been experiencing weird lag when pvping lol, like i'd be getting 3+ sec delays. Before and after the match i'd be back in the pve enviroment which is non laggy for me oddly.
So why is it that i lag only in pvp at times like this XC.
I had like 5 matches in a row where someone on my team would d/c / get the symbol; whether it be me or someone else it always causes the team to lose bad.
It's technically saying lucky for you guys we are an easy win because of the 3vs4 situation.
Yay nonstop 20 marks for the quick Qs tho lol