Notification not working

Though I have subscribed to a number of threads recently I am not getting notifications for them when new posts are made.

I've checked my profile and the email address is correct and the thrreads are in my subscription list.

I've also checked my ISPs spam folder and the one on my P.C.

Notifications used to work and as far as I can see everything is in place but no emails. The last notification I received was on 19 July 2016.

Anyone else having problems or is it just me.

BobC