Need help, having massive lags and disconnects in private matches

Hello I am looking for any clues on how to fix this issue, when I play ranked or exhibition with random people I do mostly fine, but almost every person I played with privately since PC release I had massive lags and disconnects at end of first match or beginning of second. What is weird, when I invite someone first time, I have no problems inviting him and playing until first lag storm and disconnect, then I cant even reinvite him, getting errors.

Can someone help me with this? Is this because of distance? I am from Poland and most of my opponents were from US afaik, or maybe my godawful ISP is the cause? I am using ethernet cable by the way.

Disconnect both router and console for 3 minutes. Try again after that.

Also take a look if you have Open Nat

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