Heads up, Creators: On Dec 13-14 you may see a noticeable decrease in your sub count as we remove spam subscriptions. If spam is removed, you'll see a YouTube Studio alert: https://goo.gl/qGDBvX This should help give you confidence that the subs you do have are real fans!
I am a YouTuber from Kosovo which in September I had almost 33K subs. But since then I've had drops on subs even though I posted engaging and well received videos (like almost 10 a day). And now I've lost 3.5k subs. This glitch was awful for us. Hope this gets better now. Please!