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Technically the fault is actually from the casino, though I haven’t experienced such before . Because you actually play your role as the bettors trying to secure the little amount of your money staked . Based on the research I’ve done, I think a few things could cause the cash out option to freeze, including server overload, odds fluctuations (since live betting odds change very quickly), network routing issues, and other possible technical problems. Let me use the opportunity to say this is better to save your little win than to end up losing or with nothing .
In my opinion, the bookmaker is mainly responsible in this situation, but only if the problem really happened on their side. The Cash Out feature is offered to players specifically so they can close their bets early and get at least some of their money back. And if a bookmaker offers this option, it should work properly.
In that situation, I'd definitely save screenshots, the time of the cash-out attempt, and the betting history, and then contact support to ask them to check the server logs.
And I also think Cash Out shouldn't be seen as a guaranteed way to avoid losing a bet. It's an additional service offered by the bookmaker, and it may be temporarily unavailable. So whenever you place a bet, you should be prepared for the possibility that you won't be able to cash out early, even if the button is right there on your screen.