If you ever find it difficult to access your Yahoo account or if you find that Yahoo email stopped working you can try any of the solutions mentioned below to resolve the issue:
Reset the web settings and enable JavaScript in the browser
Before login into your account, disable the pop-up blocking
Clear your web browser's cache data and restart your PC
Temporarily disable your firewall and antivirus installed on your system
Disable Protected Mode on the internet explorer
If these solutions do not resolve the error, you can call the Yahoo Customer ServiceNumber and ask for additional support.