Subject: Voyager 1
https://blogs.nasa.gov/sunspot...

Recently, the TMU began transmitting a repeating pattern of ones and zeros as if it were “stuck.” After ruling out other possibilities, the Voyager team determined that the source of the issue is the FDS. This past weekend the team tried to restart the FDS and return it to the state it was in before the issue began, but the spacecraft still isn’t returning useable data.

https://voyager.jpl.nasa.gov/f...

What a triumph that they were able to take advantage the slingshot alignment of the planets and that the probes have been maintained this long.