Can springs go soft?

[stuey]

Hi guys, I was wondering if anyone has ever noticed a set of shock springs going soft? I have a set of silver Associated springs on the rear of by B4, and the rear seems a bit prone to collapsing. I have done the usual stuff to help stop it, but it still happens. I have no idea how old they, but they must be at least 10 years old. Is it worth trying a new pair??