Can you supply more details?
Email client?
Browser?
The first step in any troubleshooting is to try to access your account using another Browser or computer.
Does the same issue happen?
Next clear the browser cache/cookies.
*For Internet Explorer browser: Press CTRL+SHIFT+DEL simultaneously and click Delete
*For Google Chrome: Press CTRL+SHIFT+DEL simultaneously and click Clear Browsing Data
*For Firefox: Press CTRL+SHIFT+DEL simultaneously and click Clear Now
(other browsers are similar)
Asking an effective question will get you help faster.
Read how here
Advice offered in good faith. It is your decision to implement same.