unrealistic data rate peak after network reconnection

After some reconnections of ethernet connections an unrealistic data rate peak appear in the network resource graph (unrealistic because it is a multiple of the physical maximum of the connection medium, e.g. 5 GB/s for 100 MBit/s ethernet), see attached screenshot for details.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: gnome-system-monitor 3.15.91-0ubuntu1
Uname: Linux 4.1.4-040104-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Aug 15 13:11:48 2015
InstallationDate: Installed on 2015-06-08 (67 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-system-monitor
UpgradeStatus: Upgraded to vivid on 2015-06-09 (67 days ago)