It's normal to see fluctuation in subs count as YT performs regular checks and removes the spam account from your subscriber count. More info here: https://goo.gl/vaHoKS . Hope this helps clarify.
Just to confirm, are your subs reporting that they are getting unsubscribed from your channel? We use technology to identify spam accounts and we don't remove legit subscribers from the sub count. Let us know.
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Hmm, please send a feedback report directly from YouTube with these steps: https://goo.gl/WdI0BK . While every individual report may not get a direct response, we do review everything and use the details to investigate and fix issues. Thanks.
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