Why do stowers have to stop?

I think it's stupid when my delivery station does this. They make us constantly stop stowing for 5 minutes which makes our aisles build up causing us to fall way behind. This makes no sense because we have to be done stowing when it gets time for pick and stage and that will not happen if we are behind on stowing thanks to them. Then they will end up sending out VET alerts wanting us to work overtime thanks to their fault at making us fall behind because we have to quit stowing all through the shift.