Check the Yu ID login history (login time, used device, etc.) to see if you have any idea.
（Login history）
・For smartphone
After logging in, select Top page > Hamburger icon (mark with three lines) at the upper right hand corner of the screen > Login history > Login history
・For PC
After logging in, select Top page > Login history > Login history
＜Related questions＞
Q. How do I view the login history?
When you check your login history and finds an unknown login, it may be an unauthorized access from a third party.
Take following measures to prevent unauthorized login attempts.
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Change login password
· For smartphone
After logging in, select Top page > Hamburger icon (mark with three lines) at the upper right hand corner of the screen > Login information > Login history
・PCの場合
After logging in, select Top page > Login information > Login history
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Set two-factor authentication
You can enhance security with identity verification through the additional authentication via app or SMS/e-mail , in addition to the entry of ID and password when you log in to your Yu ID.
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Terminate your Yu ID account and create a new one
If you have concerns about the continued use of the same account, terminate the active account and create a new one.
* Note that by deleting your account, you will lose all access and will not be able to log in to various services that you are currently using with your Yu ID.
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＜Related questions＞
Q. How do I change the password?
Q. How do I set the two-factor authentication?
Q. How do I terminate my Yu ID?