Confirming we've fixed the underlying YouTube Analytics issue that caused lower than normal views this morning. More details here: https://goo.gl/1aAtc9 https://twitter.com/TeamYouTube/status/1075438351828697088 …
Also, fluctuations in your subscriber/viewer count is normal. We regularly remove spam subscribers or it is probably users unsubscribing and subscribing to your channel normally. Here's more info: https://goo.gl/croiE1 . Hope this helps clarify. (2/2)