Impressions suddenly zero on sponsored product?

Two of our 25 sponsored merchandise immediately can’t get an impression to avoid wasting their life over the weekend. The advertisements nonetheless say they’re delivering, and all different advertisements seem advantageous. The merchandise are nonetheless in inventory with 1 or 2 day supply accessible. Spoke with help and so they couldn't discover something and simply steered rising bids and including extra key phrases. Some other concepts what's up??