Recently with a site update the settings were set such that you get 1 email a week per thread you are subscribed to. I was hoping it would be 1 email for all topics with a summary, a nice way to keep you updated on the latest topics.
Here is a step by step instruction on how to manage subscriptions.
Step 1, click the User CP link in the top left:
Step 2, Once on the User CP page, click setting
Step 3, Select your desired options
If you choose Subscribe, with no email notification, then when you visit your User CP area in the future, you will be able to see all the threads you want to watch.