Yep me too .. (wo got about 300 of them)

Probable cause :
Low cost motherboard with crappy bios and low cost networkchip (Broadcom).(which HP claims is quality =>lmao)
Even when loading the supported DOS broadcomdrivers they are crappy.
Reason is the f*** acpi irq sharing.
In the bios of your HP you notice somewhere a place where you can set the wished irq of a device.
You will see about 6 devices and for each 3 irq's to pick. (5,10,11).=> told you crappy bios. At least they didn't put no more the harddisk right above the processor ,like the model before .
Yep , I suppose we will have to wait till crappy bios becomes less crappy.. .

greetzzzz,