network keep disconnect

Hi guys,
I’ve just installed openSUSE 11.0 and recently I got this networking problem.It just keep disconnect and to make it work I have to do ifdown and ifup for the eth0.
It looks like problem with DHCP ,it is connected but no data transfer between the router and the pc .

Any suggestions ???

regards,

Ibraheem

When I boot in failsafe the problem gone.
Is there any solution ???
:frowning: