How do I keep yahoo permanently logged in?

We keep getting kicked out of Yahoo mail (asking us to log back in again). We've set it to "ask every 24 hours"; we accept cookies. We've cleared cookies. We remain logged into other cookie-lovin' sites (i.e., Amazon). This happens in IE and...

Today I finally thought everything was ok until just a few minutes ago and it said i had been logged off because i was logged on at another computer. i only have one computer and i don't know anyone who knows my email.

yahoo messanger

Every time I open IE I have to log into Yahoo in order to view my mail and use my toolbar. I think there is something wrong with my cookies (they are getting deleted automatically?) I'm not exactly sure..

I keep getting (spuratically) logged out of messenger then logged back in.

I use my yahoo as my homepage, but each time I start my computer it logs into the central yahoo, even though I've checked off, keep me signed in??

Yahoo Messenger thru yahoo mail is getting disconnected every 1/2 second. Very bad and frustrating.

I can't see any common logic for why I get logged out - somtimes I open Explorer and it goes to my site other times it goes to the generic my yahoo and I have to log in The site says I am only logged in for 2 weeks but this happens at random time cycles...

I have logged on to another computer? I am hoping that someone is not logging into my account from another computer. I have been suspicious that my ex may have put a key logger on my computer to get my passwords, because odd things continuosly happen...