Hi @Mister MoHaGaTaGa ,
The issue is really strange. As you said it's not a network or computer issue.
Could you please have a check the user's group policy in DC to see if it's different with other users.
If the policy is same as other user, I'd suggest you may remove the user and re-add the user to the group for a try.
Regards,
Zoe
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