The iconic telescope is safe and stable, NASA says.

NASA’s Hubble Space Telescope is taking an unexpected break.
The iconic observatory went into a protective “safe mode” early Sunday morning (March 7), but its handlers seem confident it will bounce back in relatively short order.
“At ~4:00 a.m. EST [0900 GMT] on Sunday, the Hubble Space Telescope went into safe mode due to an onboard software error. All science systems appear normal and Hubble is safe and stable. The team is working plans to safely return it to normal science operations,” Hubble team members announced Sunday evening via the telescope’s official NASA Twitter account.
https://www.space.com/amp/hubble-space-telescope-safe-mode-march-2021