Several people have complained about this recently. I had to stop using my Dozy account because I received no notifications there but they work fine on Dodgy. If you've had this problem long-term why not open a new account?
I understand about 5% of all accounts experience some difficulty. You and I are just got lucky. :)
Well it happens to me occasionally don't worry about it. Should be better tomorrow. Possibly try logging off and restarting computer. I have done this and sometimes helps or internet may just be slow today for you.