Version:            (using KDE 4.3.4)
Compiler:          gcc version 4.3.4 (Gentoo 4.3.4 p1.0, pie-10.1.5) 
OS:                Linux
Installed from:    Gentoo Packages

I'm using the network monitor widget. It shows good info most of the time, but sometimes it rescales the plot to like from -3.5 million KBps(lower bound) to 0 (higher bound) and doesn't change. 
It looks then, like the plot had always the maximum value. 

It's on my ethernet interface eth0.

Expected: It should have always 0 as a lower bound