Be sure to pay attention if YouTube has already unsubscribed you. The channel just rose to 152 subscribers and has now dropped back down to 100. Thus, 52 people were just unsubbed.
This is how pathetic Google is... this is why I am struggling to get my channels up to 1k, 2k and 3k subs...
See this comment:
On the day this comment has been made, I've seen the count drop by 50 two times, it has possibly happened more.