i cannot receive emails to my hotmail account

I can send emails with no problem.

I can received some emails from some senders, but it appears only about 5% sneak through.

I have removed both of my POP3 accounts to see if this helped.

I have deleted a few hundred messages to see if this helps.

I have changed my password.

I have setup 2 step verification.

This is an ongoing problem for months now.   My email will work perfectly for weeks, and then all of the sudden, it will start kicking back emails to my clients.

I feel that my account may be compromised.

I utilize this email for my business and it is imperitive that it works perfectly.  I love Hotmail, but I am at the point of finding a new email provider if this cannot be fixed. 

I would appreciate it if a Microsoft representative can identify the root cause of this issue.

Please help,

Thank you !