Quoting since maintenance is a few hours away...
Character name (exact spelling): Jeneeus
Character class: Sorcerer
Approximate time: From Beta Testing until 6:30pm PST
Issue: Auto disconnection
Probable Cause: probably because of Orleans's Necklace or Rainbow Scarf equipped
Screenshot:
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Character name (exact spelling): Guru-kun
Character class: Sura
Approximate time: From Beta Testing until 6:30pm PST
Issue: Auto disconnection
Probable Cause: probably because of Upgraded Clips and Upgraded Hoods and Upgraded Shoes equipped
Screenshot:
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Character name (exact spelling): Guru Bebe
Character class: Ranger
Approximate time: From Beta Testing until 6:30pm PST
Issue: Auto disconnection
Screenshot:
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Character name (exact spelling): GURUmerchant
Character class: Geneticist
Approximate time: From Beta Testing until 6:30pm PST
Issue: Auto disconnection
Screenshot:
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Character name (exact spelling): GURUman_VA
Character class: Royal Guard
Approximate time: From Beta Testing until 6:30pm PST
Issue: Auto disconnection
Probable Cause: probably because most iRO-restricted-carded (MVP, Sealed, Mini-boss) armors and cards were mostly located here.
Screenshot:
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EDIT: NOTE: All of them belong to one account but not all of the characters in this account have this problem. My Ninja is somehow safe and no problem whatsoever and uploaded a screenshot yesterday before the Screenshots above were uploaded.
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EDIT 2: Added probable causes to some characters that maybe help resolve the issue easily.
EDIT 3: The common thing in them is that they all have a pRO-exclusive quest skills. Also I forgot that not all are having an error from beta testing but from the start of the official release. I forgot which of these 5 characters were fine in beta test (except Ninja since it's safe from the start).
EDIT 4: Now added screenshot for my Royal Guard and other possible problems.