Denise Hill, writing for NASA:
A series of planned commands sent to NASA’s Voyager 2 spacecraft on July 21 inadvertently caused the antenna to point 2 degrees away from Earth. As a result, Voyager 2 is currently unable to receive commands or transmit data back to Earth.
Voyager 2 is located almost 12.4 billion miles (19.9 billion kilometers) from Earth and this change has interrupted communication between Voyager 2 and the ground antennas of the Deep Space Network (DSN). Data being sent by the spacecraft is no longer reaching the DSN, and the spacecraft is not receiving commands from ground controllers.
Thankfully, this shouldn’t be the end of the nearly 50-year mission, as the spacecraft is is programmed to reset its orientation several times a year, and should do so on October 15, restoring the trickle of data from one of the most amazing feats of engineering ever created.