Sirene auf Shift + F funktioniert nicht so wie sie soll

//F Shift Key
    case 33: {
        if (_shift && playerSide in [west,independent] && {vehicle player != player} && {!life_siren_active} && {((driver vehicle player) == player)}) then {
            [] spawn {
                life_siren_active = true;
                sleep 4.45;
                life_siren_active = false;
            };

            _veh = vehicle player;
            if (isNil {_veh getVariable "siren"}) then {_veh setVariable ["siren",false,true];};
            if ((_veh getVariable "siren")) then {
                titleText [localize "Landsirene AUS","PLAIN"];
                _veh setVariable ["siren",false,true];
            } else {
                titleText [localize "Landsirene AN","PLAIN"];
                _veh setVariable ["siren",true,true];
                if (playerSide isEqualTo west) then {
                    [_veh] remoteExec ["life_fnc_copSiren",RCLIENT];
                } else {
                    [_veh] remoteExec ["life_fnc_medicSiren",RCLIENT];
                };
            };
        };
    };