Closure policy does not work on events in blackout status. There is however a small change to get it working.
In the cell kb\rules\im_internal.mrl file, locate the section for the rule im_internal_closure and change these lines:
$POL.selector_ecf ($EV) where [ $EV.status != CLOSED AND $EV.status != BLACKOUT ]
updates ALL $POL.closed_events ($CLOSE_EV) where [ $CLOSE_EV.status != CLOSED AND $CLOSE_EV.status != BLACKOUT ]
$POL.selector_ecf ($EV) where [ $EV.status != CLOSED ]
updates ALL $POL.closed_events ($CLOSE_EV) where [ $CLOSE_EV.status != CLOSED ]
then recompile the KB (mccomp -n <cell>) and restart the cell.
Thanks Steve , I found the reason same as your comment and tried to update only cell config but after updating compiling , cell did not came up for 30+ min so I reverted the config and then need to restart TSIM twice and after around 2 hours everything went stable .
Not sure was it config issue or some other issue with TSIM .
Will try again sometime .
Thanks for your response .