The West End traffic lights went out again this weekend, only a few days after the last outage.
The intersection on the corner of Malfroy and Old Taupo Rds (State Highway 5) has been experiencing intermittent outages since Saturday night.
Sergeant Simon Paget at Rotorua police said they had the same problem a few days ago.
"I'd like to know the answer to why that particular set of lights keep going out," he said.
"Hopefully they're back up and running before the busy traffic tomorrow morning."