inkscape keyboard does not respond

After about 10-15 minutes of drawing and copying and pasting objects keyboard stops responding key pressures. Does this problem may occur when I switching languages (Alt+Shift)? Installed languages are Russian and English (US).

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: inkscape 0.48.5-2ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-30.40-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.14.7-0ubuntu8.1
Architecture: i386
CurrentDesktop: Unity
Date: Tue Feb 3 14:39:40 2015
ExecutablePath: /usr/bin/inkscape
InstallationDate: Installed on 2015-01-28 (6 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release i386 (20141022.1)
ProcEnviron:
 PATH=(custom, no user)
 LANGUAGE=ru
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: inkscape
UpgradeStatus: No upgrade log present (probably fresh install)