'Cash Out Suspended' means that at the moment the betting site has disabled the feature for that particular wager or the event as a whole.
This happens for a few reasons, for example if a penalty kick is awarded in a soccer game, a team has just scored a touchdown in the NFL, or a player is injured on the court. The suspended cash out usually only lasts for a short period of time until the situation that is dramatically impacting the game is resolved ( the kick is taken, a rain delay ends, the players is taken off the field).