Please help me out.

I purchased a Dream League in-game ticket. But just after the game starts (just after the 00:00) the lag starts.
Can't hear casters any more and getting the red disconnect sign.
The game freezes a good 5-10 seconds, before jumping to next freeze.
This never happened to me before for other in-game ticket that I have bought.

P.S. watching on Twitch is fine.