There are various reasons why the Cash Out feature is disabled on an event. This can be due to, but not limited to:
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1. Event Suspension

2. Match is about to end

3. Technical Issues

4. Result is soon to be established

5. Bet offer has been settled

6. Status of the match (e.g. possible goal)

7. Cash Out is not available on the event at all

Most of the time, the Cash Out feature will be available again after a couple of minutes; unless, the feature is not available at all on the event.