Hm, I'm still getting mine. But we do find, from time to time, that people suddenly stop getting their emails for a period of time. It's weird, and as far as I know, the cause is unknown. It happens for staff as well. I know that's not much of an answer, but it's all I can suggest.
This may not help, but I have weaned myself off email notifications this year and switched to checking the My SitePoint link here in the forums. I find it more reliable ... but I realize it's not for everyone.