We've seen similar reports regarding subs drop and we're currently working on fixing it. Also, it's normal to see fluctuations in your subscriber count. This is because we want to make sure the numbers are accurate. Here's more info: http://goo.gl/6B1Eb6 . Hope this helps.
@TeamYouTube Since September my channel's been having 100+ subscribers daily unsub my channel because of a glitch.
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As you can see the situation isn't just a normal fluctuation, I've lost over 10,000 subs in the past month (100+ lost subs daily) & I've been talking to your team over chat for a month now & still no solution on the matter.pic.twitter.com/7rGlJGAKWg
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