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The Crown appeared to have acted with "significant speed" in moving the process, with nominations for the hapu kaikorero closing just over a month after the mandate was granted.
But it had been "unacceptably slow" in giving important information to the claimants and this was contributing to disputes and tensions in the region.
"Given the size and complexity of this settlement and the level of opposition to the mandate, the Crown has a heightened duty to ensure the process is robust, fair and transparent, and the Crown's conduct to date, particularly with regard to disclosure of information, raises concerns at this early stage," she said.
Judge Reeves asked the Crown to advise the tribunal by March 31 whether it would agree to pause the election process so claimants could be properly advised.
Te Kotahitanga o nga hapu o Ngapuhi spokesman Pita Tipene said the group was seeking urgency for a hearing before the Waitangi Tribunal opposing the Crown conferring the mandate on Tuhoronuku. He was confident it would get it.