[ubuntu] Occasionally have to dump passwords

Why is it that on some occasions that my Evolution email will just repeated re-prompt for the passwords every time I attempt to send/receive emails and then I will have to wind up going into Seahorse and delete the password setups for Evolution and then reset them up by re-entering the passwords once I am back in the email application ?

It's as if something is corrupting the files that these passwords are stored in.

This problem has existed in Linux for a number of years now, sure wish someone would fix it !!!

Please don't suggest that I use application other than Evolution, other than this problem I really prefer it.

Thanks.