If your subscriber count has decreased more than usual around December 13-14, it could be due to the recent removal of spam subscriptions. If that’s the case, you’ll see an alert in YouTube Studio letting you know. Here’s more info: https://goo.gl/rzLgSG . Hope this clarifies.
@TeamYouTube My sub count was decreased. It looked like someone hacked into my YT account then I read the note from YouTube. Please explain more about this. I was so excited about finally getting to 4,000 sub's since I started really getting back into my channel this year! 

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