Generally, it's normal to see fluctuations in your subscriber count. This is because we want to make sure the numbers are 100% accurate, so we perform additional verification and spam reviews. Also, it's likely folks are subscribing and unsubscribing as well. Hope this helps.
im having the same problem. I asked them yesterday and I swear they just copy and pasted the same thing they said to me. this is a problem on their part because there so many new people coming to my channel from a video that did rly good and subs r going down...