could be as simple as a timer, from the moment you lag out of a raid, you have X amount of time to rejoin.
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Gears of War did this, you get 5 minutes to rejoin the game regardless of whether you left on purpose or not and if you don't rejoin you get a 15 minute ban from multiplayer.
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didn't know that. but yeah i think a system like that would work. i mean, if your not back on in 5 minutes, your probably gunna be offline for 20 or more anyways, so it would work well i think.
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Overwatch has a similar system as well