I'm playing zombies off-line and I got a message saying game no longer in session. Why?

Call of Duty Black Ops 4 Zombies

I was playing zombies off-line split screen. Then in the middle of the game I got a message saying the game no longer in session. Why would that happen if I was playing off-line?

ForecastSnow430
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Registered: ‎21-11-2015

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