Clear Cache from your browser: A browser is known for storing cache and cookies of the websites you access using it. When these caches and cookies get stored in large amounts in your browser, it may lead to different problems including the ones in your Yahoo Mail account. Therefore, it is suggested to clear cache and cookies in your browser from time to time
Update your browser: It is always suggested to access your Yahoo Mail account on a yahoo supported web browser. Some of the browsers compatible with Yahoo Mail are Google Chrome, Mozilla, Firefox, Internet Explorer, Microsoft Edge, and Apple Safari. If you are already accessing your Yahoo Mail account using a recommended browser, make sure the browser is running with the latest updates.
Restart your computer: Once you have cleared the caches and cookies from your browser and have also updated it, you will need to restart your browser. After restarting your browser, access your Yahoo Mail account and see if the problem is fixed or not.
Disable browser enhancements: Sometimes browser enhancements like add-ons, or plug-ins can be faulty and may lead to issues with your Yahoo Mail account. Therefore it is suggested to consider disabling the browser enhancement temporarily. However, when disabling browser enhancement. Make sure to disable one extension at a time to know which one is exactly causing the trouble. Once you find a faulty enhancement in your browser, remove it and then access your Yahoo Mail account.
Temporarily disable antivirus, antispyware, and firewall products: Like browser enhancements security programs such as Antivirus, Antispyware, Firewall products can also interfere with the functionality of your browser and may lead to different issues with your Yahoo Mail account. So, it is suggested to temporarily disable these security programs (one at a time) to check which application is exactly causing the problem. Once you find the application responsible for the issue, configure the settings of that application accordingly to prevent it from causing the trouble.
See if the Yahoo service works from another computer or mobile device: If the problem persists even after following the above-mentioned suggestions, consider accessing your Yahoo Mail account on a different computer. If you can access your Yahoo Mail account on other computers or devices, it means the problem is with your device on which you are experiencing the problem in your Yahoo Mail account. Fixing the issue with your device will automatically clear the error in your Yahoo Mail account.
Reset your browser to default settings: You can also try resetting your web browser to its default settings and check if it helps in overcoming the problem in your Yahoo Mail account.
Need to contact yahoo support services to fix the email problems.