Service Interval coding

Hi, just wandering, my church services have the same shedule every week, so we start at 8am, our first prayer session finishes at 8:10 etc. At the moment I'm using the service interval, to automatically show on the foldback screen how long is left for each session, however, at times, the countdown timer does not seem to update, and it will remain on 0:00 for a while.

My volunteers aren't the sharpest, and so I would prefer for this function to be automated, any advice on how to fix this, or is there a better way? 

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