Euni, That sounds like a browser related issue, perhaps a "timeout" error. I would suggest downloading and installing another browser .... Firefox, Opera .... dare I say it .... Chrome.
However ... HN as a "home page" is a data eater. It sounds like you are trying to access your email by "webmail" .... always a problem. I really suggest that you download and install Thunderbird as an email client. Usually getting email thru an email client is much smoother than web view.