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You should not need to enter your credentials on subsequent connections to SU_Student_WPA2 or SU_Staff_WPA2 unless you change your password.
Troubleshooting
You can clear out the credential cache by editing the registry. Fire up the registry editor (START->RUN->REGEDIT) and delete the HKEY_CURRENT_USER\Software\Microsoft\EAPOL\UserEAPinfo registry key.
(DO NOT do this unless you feel comfortable editing the registry)
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