Some members of the National Broadcasting and Telecommunications Commission (NBTC) board are upset with panel member Supinya Klangnarong for leaking inside information to social media.
Ms Supinya on Wednesday again tweeted against the board's decision for an approval of the final revised draft of the 2.1-gigahertz spectrum licensing terms, concern over possible collusion among the three major mobile operators and a too-low reserve price for a third-generation licence.
"We plan to raise this issue to the board for consideration soon," said one commissioner.
At Wednesday's board meeting, eight of the 11 members voted to approve the revised draft of the 2.1-GHz licensing terms and set the auction dates for Oct 15-20.
Two commissioners, Ms Supinya and Prawit Leesatapornwongsa, voted against the revised draft.
Col Natee Sukolrat abstained from voting.
Commissioner Suthiphon Thaveechaiyagarn said it is unethical for a member of a national regulator to criticise any board resolution and leak inside information to the public.
"We need to ask her to explain her motive," he said, adding that several members have condemned Ms Supinya for acting inappropriately.
The National Telecommunications Commission, the precursor to the NBTC, set ethical conduct as a core discipline.
"Regulatory body members must take joint responsibility for all decisions made and not just try to project a good individual image," said Mr Suthiphon.
Ms Supinya yesterday insisted on her right to tweet, saying social media is a private space for expressing different opinions. "If other members disagree with my messages, they can share their comments in the space instead of dictating that everyone agree with all issues," she said.