Surge protectors aren’t like diamonds. They have a definite lifespan.
At some point, your surge protector will stop protecting your gear from
power surges and become a dumb power strip.
It’s difficult to tell exactly when a surge protector loses those
protective powers and just functions as a power strip. But, if you’re
still using an old surge protector you purchased ten years ago, it’s
probably long past time to replace it.