VPN disconnecting

I have 2 VPN connections. First is fine but second disconnects every time I start video or flash file and it keep disconnecting every 5-20 seconds while I watch video. This is very strange, first VPN connection have absolutely same settings and it never disconnects. What to do?

If your not using a third party VPN software, that is, your using windows 7 built in.. sounds like a problem at the other end?

If your using third party .. ie. openvpn or Cisco.. are you sure it works with windows 7?