Depending on number of subs you have, your channel authority and keyword demand, the algo sends you a certain amount of views. The video performance stats are analyzed. If it performs bad, traffic to it is quickly cut. If it performs well, traffic is increased. This process happens within the first 1 to 3 days, closer to 1 to 2 days. Your vid is also ranked against all similar tagged vids to determine which ones are worth sending traffic to. If you are seeing the same patterns across multiple vids it means your vids are falling short on KPIs and the algo is stopping traffic to them.