If you're having login or performance issues, first check which version of LINE you can use on your PC here, then try the following:
Windows and Mac version of LINE
• Uninstall the PC or Mac version of LINE and then reinstall it.
• Restart your computer.
• Temporarily disable any firewalls or security software you have in place or allow LINE to connect to the internet.
• Disable any resident or customization software such as WindowsBlinds.
Chrome version of LINE
• Uninstall the Chrome version of LINE and then reinstall it.
• Update the Chrome browser.
Note: If you're using Chrome OS, please also try updating the OS.
• Disable background internet connected apps and extensions.
• Delete your cache and browsing history.