What are the signs that an SSD is failing in a MacBook Air?

Regarding the MacBook Air: The main red flags are random freezes or kernel panics, especially during file reads/writes, apps hanging or crashing, corrupted files, slow boot times, and a “S.M.A.R.T. status: failing” message in Disk Utility. Back up immediately with Time Machine to an external drive and add cloud backup for critical files.