Shoutbox

Hi, im having problems with MSN Messenger 7.5, well iv had it for a while and the problem has just been occuring recently now every 10 mintutes or so. I am online and poeple talk to me, but 10 minutes later, i am still online BUT everyone suddnely stops tlakin to me, so i talk aback at them they dotn respond, i sign out back in, and i asked if i was online 10 seconds ago they say no. anyone know what this problem is? its been happening every 10 minutes and its really making me sick.

thanks