Your internet provider having a dynamic ip address shouldn't have anything to do with anything... Unless you have a business account or a web page thats the only way you are going to have a static ip address... It sounds like you may have someone hacking into your account, so the password reset is doing what it is suppost to do which is basically locking you out of the account... I personally would try deleting cookies and cache if that doesn't work then you need to contact customer support and report the issue...