Background: I was trying to do a long SMB to SMB network transfer on a computer running xubuntu, but I've encountered a very weird problem:
My computer loses its network connection after random amount (in range of 10-40min) of inactivity, and any user activity (even moving the mouse) brings it instantly back up. The computer is connected via ethernet cable, not WLAN. When the connection drops, it stops answering and also disappears from the client list of the NAT router after a while.
I tried running a script that automaticly mimicks user behaviour with xdotool, but that does not seem to work. I also noticed that it's not just network activity that stops - the script outputs an increasing number every minute, and when the computer drops off network I noticed that the number doesn't increase! The script and network activity continues as if nothing had happened when I move the mouse, press shift or anything.
I found are no BIOS options relevant to this, and there's no such features in xubuntu power management I know of.
The computer is a Compaq Presario 6540fi.
Question: Any ideas what might be causing my computer to behave like this?
I did solve the data transfer issue by, ehm, duct-taping my mouse to a rotating tabletop fan to mimic user activity. (Yes, really.) Regardless, I'm still quite interested in what actually causes this weird issue.
(Cross-posted to Super User since this might have nothing to do with the OS...)