Users vanishing from domain admins

For some reason I have a user that keeps vanishing from Domain Admins groups every couple hours and I cant find why?

Checked what I think was all applied GP's for that user and nothing stands out. Thoughts on where I should look/check?
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progjmAsked:
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Seth_zinCommented:
It does sound like a GPO setting, could be wrong but check here on your policies:

•Open the Group Policy Management Console
 •Edit the Default Domain Policy
 •Navigate to Computer Configuration > Policies > Windows Settings > Security Settings > Restricted Groups

Anything listed?

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progjmAuthor Commented:
Nothing listed in there, let me search the other GP objects for that setting
progjmAuthor Commented:
Yep it was in another object, thank you for your assistance!
progjmAuthor Commented:
Thank you!!!
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