First post here so glad to be here!

My problem seems to have appeared since the upgrade from Ubuntu 13.04 to 13.10 :
When I wake up my desktop computer after suspend, everything seems to work fine except there's no network: I can see the indicator of wired network on the bottom right, but no websites can be reached.
I've tried to disconnect, than connect again the network (by clicking on the indicator and doing "disconnect", than select again may network), but it changes nothing.
Any idea?
Thanks a lot for your help in advance!
