Some 47,000 Tesla owners have filed a class-action lawsuit against the California-based automaker, alleging their vehicle’s Autopilot systems are “dangerously defective.”

The lawsuit was filed April 19 in a U.S. District Courthouse in San Jose, California, reports Automotive News.

The complainants allege they have “become beta testers of half-baked software that renders Tesla vehicles dangerous,” according to an excerpt from the litigation proceedings.

Specific complaints include consumer accounts of Model S and Model X EVs unexpectedly veering out of their lanes as well as “lurching, slamming on the brakes for no reason, and failing to slow or stop when approaching other vehicles.”

The lawsuit represents owners of Teslas purchased in 2016 and 2017.

(Automotive News)