I used to always get an email from private messages and subscribed threads instantly but all of a sudden they just stopped.... any ideas?

 

Email notifications, globally, are working normally. Make sure your email provider is not sending our email notifications to your Spam/Bulk/Junk folder. Your provider may have a web-based client where such content can be viewed, which may not be downloaded in a pop-based email client.

I'll monitor for any email notices from your provider to see if they're being rejected from being received.