Is this setting in your setup, and did you try changing it?
LAN Power Saving
(select models only) Enable/disable LAN Power Saving. When enabled, saves power when the computer is in DC mode
Looks like you can download a "HP Wireless Assistant" utility...see if that might help.?
Software & Driver Downloads Compaq Presario CQ60-215DX Notebook PC - HP Customer Care (United States - English)