mIRC keeps disconnecting every 10 or so minutes.

The details:
1.I have upgraded computers and part of that upgrade is a new modem/router and vista home premium.
2.My old winxp computer is linked to the same router.
3.On my old computer using mirc v6.17 I have no problems, But with mirc v6.31 it disconnects as mentioned
4.on my new vista computer I have tried mirc v6.31 & v6.16 (don’t have a installer for v6.17) and it just keep disconnecting
5.I am using Hydrairc on the new computer. And that works fine.


Can anyone help me?