On June 4, 1973, it was announced that Lunokhod 2 had stopped communicating with its controllers in Soviet Russia. It was believed that the rover's open lid (which was closed during lunar night to retain heat) dug into the side of a crater wall, collecting a mound of dust. When it was closed during lunar night, the dust was dropped over its radiators.
During the next lunar day, sunlight heated the dust (which is a very efficient insulator), overloading the radiators and roasting the rover. Lunokhod 2 overheated and probably failed some time during May 1973.
Despite its accidental overheating, Lunokhod 2 was a very successful mission, sending back 86 panoramic images and over 80,000 TV pictures to Earth. Many science experiments were also carried out.
Interestingly, as it only takes light a little over a second to travel from the Earth to the Moon, Lunokhod 2 was controlled in "real time" by 5 operators.
Other Russian hardware has been imaged by the LRO, including the sample return missions Luna 20, Luna 23, and Luna 24. These latest detailed images of man-made equipment on the lunar surface comes soon after the Apollo landing sites were imaged, for the first time, last year.