Dronemaker DJI has warned that some of its unmanned aerial vehicles are suddenly falling out of the sky mid-flight. The company says there have been a'small number' of reports surrounding its Matrice 200 series drones, where a power issue is causing them to crash mid-flight. However, the warning has prompted UK police to ground some of their drones. DJI says there have been a'small number' of reports surrounding its Matrice 200 series drones (pictured), where a power issue is causing them to crash mid-flight The United Kingdom Civil Aviation Authority issued a safety notice saying that some 200 model drones lost power mid-flight and dropped straight down to the ground. In one case, a drone experienced an'in-flight issue' and landed on the roof of a commercial building.

Drone leader DJI introduced its M200 series of rugged drones on a windy mountaintop overlooking the city of Barcelona, on the Sunday before Mobile World Congress. This was the perfect place to show them off: The entry-level M200, and the higher-end M210 and M210RTK, may not have all the gewgaws of the company's Inspire and Matrice models for professional photography, but they can operate in harsher conditions, making them indispensable to industries like construction and utilities, as well as field researchers and first responders. These demanding customers will be the first to get the M200 series when the drones ship in the second quarter. Prices haven't been announced, but the drones will be sold through dealers, meaning there'll be no doorbusters. The dream, of course, is that some of the coolest features will someday trickle down to the more attainable Mavic or Phantom consumer lines.