My host is GTXGaming, having this issue quite alot, anyone able to help?

I also use GTX, dedicated and this issue isn’t their fault, but your internet or steam issues. Restart steam fully 

im using gtx and the same thing is happening to my players

ESC > OPTIONS > SCREEN > MODE > Change Exclusive to Borderless

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FYI my girlfriend had that issue for the last 3+ months, she finally listened to me when I told her to change to borderless... and guess what?  No more timeouts/invalidauthsession :)