I was subscribed to 30+ (I think) projects. I changed my email address this morning & lost all my Project subscriptions. I had expected that they would transfer over to my new email address & maybe they will if I wait long enough. In the interim, though, it's cost me a good bit of time trying to figure out why they disappeared & how to get them back!
I plan to change my email address back & will report my results here after that's done.