As another commenter said, they are designed to work for 5ish years. That we have had Hubble so long is essentially a miracle. Same thing for the Mars rovers that limped on for years despite only being designed to last months.
Also your claim about the instruments on Hubble is incorrect.
Also your claim about the instruments on Hubble is incorrect.
See: https://www.nasa.gov/content/goddard/hubble-space-telescope-....