Yahoo Email problem, Help Please

[Devilish]

I have another question for this forum.
I am using the free yahoo email service (IMAP4) and I have been having problem with it since I upgraded to WM 6.1. Sometimes when the phone is trying to look for changes on my yahoo accounts, it comes back and ask for password. When accounts were set up on the phone, save my PW box is checked. Sometimes it does check my email account with out a problem and sometimes it does not work even if I enter the password in the box. I removed the account on my phone and did start fresh but still having the same problem.

I was wondering if anyone here is running into the same problem.