AUSTIN (KXAN) — Lime is working to fix what it calls a “bug” that caused “sudden excessive braking” in its scooters.

Lime wrote in a post on its website Feb. 23 that the bug in its firmware would “in very rare cases” cause the scooter to brake harder than it was intended and stop unexpectedly. Lime says it would usually happen when a rider was headed downhill at top speed and hit a pothole or other obstacle. It added that the issue affected “less than 0.0045%” of all Lime rides but that some riders had been hurt.

The company said it developed a series of firmware updates and is confident they will fix the issue.

“We have already rolled out some of the firmware fixes, which immediately resulted in a material reduction of occurrences,” Lime wrote. “A final update is now being dispatched to every Lime scooter in the market and will be complete shortly.”

Lime also detailed a series of safety checks riders can do before and during their ride, including testing brakes and wearing a helmet.

“Use extra caution in the next few days while we issue the final firmware update — especially when riding downhill,” Lime wrote. “Always stay in full control of your scooter and don’t go full speed while riding downhill.”

Lime has permits to operate up to 5,000 scooters in Austin.

On Feb. 20, an Austin man sued Lime and claimed his scooter malfunctioned. Three minutes into the ride, Jeremiah Mahoney said “Literally, the scooter just stopped. It just locked.” He was thrown into the middle of the road.

Lime did not respond at the time to a request for comment about the lawsuit.