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Generally, it's normal to see fluctuations in your subscriber count. If it seems that your subscriber count has changed or dropped, it could be for one of these reasons: 

• Viewers are subscribing and unsubscribing to your channel normally. If a user unsubscribes and then re-subscribes to your channel, they need to reset their notifications. Otherwise, they may not see new content from your channel in their email or YouTube feed.
• We've removed spam subscribers from your channel.

If subscriber changes seem like they're outside the normal fluctuation rate, it could be due to a known issue. If you believe you're experiencing a problem outside the normal rate of subscriber count fluctuations, you can report an issue.

* Nguồn: Youtube