Sudden influx of SPAM in my InBox

I have been a hotmail/outlook premium subscriber for several years and don't mind paying for the extra "perk" of not having advertisements, having extra storage, etc. In the past week, I have been inundated with 10-15 spam emails at a time, multiple times a day, that come to my InBox instead of  going to the JUNK folder. Over the past 3-4 months, I have noticed the JUNK folder filling up multiple times a day with between 10-30 messages at a time. This is something new. I use this account for business and have other email accounts that I use for online shopping, etc, so I haven't given this email out to anyone in the past few months. What's going on that the SPAM filter isn't sending these emails to the Junk folder?