My account is: (*** email addrss is removed for privacy ***)

Ever since the "upgrade" to Outlook, my Hotmail account  randomly rejects all incoming e-mail every few days or so with no rhyme or reason.   I mean BOTH *inbox* e-mail AND *Junk* e-mail.  I am not getting anything.  Today, my rejected all incoming e-mail.  Yesterday, it worked fine.  Tomorrow, it might work again.  But on random days, the my account will simply not accept incoming e-mail.  I can sign into my account just fine.  I can even send e-mails.  But I can't receive any.  It doesn't matter if I'm accessing the account on my mobile device (an iPhone) or on the desktop.  I've never changed any settings.  E-mail is simply not coming into the account.  On certain days, it won't reject any e-mail and on certain other days, my account will reject all e-mail.  I've not noticed any pattern to this. 

This has been an ongoing issue for the past several months.  I've had the same Hotmail account for the past 15 years now (!) and have never had this issue nor any others...until the recent change to Outlook.  It's been unreliable ever since.  It would be a huge pain to leave Hotmail since everyone knows to reach me here but I can't continue to keep missing important e-mails (work or otherwise). 

Has anyone else had similar problems?  Any solutions? 

ADDITIONAL DETAILS: I have sent myself test e-mails (from other e-mail addresses) and I get bounce back error messages saying that my Hotmail account is "full" or that the sent message is 'too large' for the Hotmail account (like attachments, etc.).  Someone just texted me today asking if I'd deactivated my Hotmail account because he got 2 undelivered messages bounced back to him.