MSN signing in and out periodically...??

I've been having a problem over the last week or so (ever
since i upgraded to V6 actually) where I sign myself into
the messenger, and periodically I'm signed out without any
reason. This may happen 2 or 3 times every 10 minutes.

Usually I can only tell that I've been signed out when I
start to message someone, and then I find the whole
program closes and tells me I've been logged out, and I
have to resign in. Or I also get people telling to me to
stop signing in and out all the time, where I have no
control over it, nor am I aware exactly when it happens.

Could anyone please help me with this problem?

Thank you.