Currently some exploiters are going rogue and kicking people remotely. The way it works is by sending some request through rockstar's presence servers which causes the client to freak out and quit the current session.

This is a fix for it, but you may not be able to join lobbies with a lot of players in it. You will get matched with lobbies where there are only a few players in it, or in a public lobby with only you in it. You also cannot play with your friends, however you can do jobs yourself, like the terrorbyte jobs and resupply your businesses. You can remove this fix after rockstar fixes their servers, since this is not a permanent change.

The way to fix this for now is by blocking port range 61455-61458 (UDP, outbound), which IIRC should refuse any connection to the presence servers and stop that from happening. Of course this will break some features in social club like invites, along with the ability to invite people from other sessions into yours (since that requires communication with the presence servers).

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Here's what you need to do step by step

STEP 1 : Search Firewall in the taskbar search of windows 10
STEP 2 : Open windows firewall

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STEP 3 : In the left bar click on advanced settings

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STEP 4 : Select Outbound rules

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STEP 5 : On the right, Click on New Rule

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STEP 6 : Select Port and click next

STEP 7 : Choose Specific local ports and UDP

STEP 8 : Type


and press enter

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STEP 9 : Press Block the connection

STEP 10 : Click all 3, or whatever network you are using

STEP 11 : Type anything you want in the name

STEP 12 : Click finish

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To remove this "fix"

Follow all the steps till step 4,
look for the name you gave to your rule in step 11, right click and delete it.