usb device lost

[Luca13]

Some time i lose usb input device, first joystick, after mouse and on last keyboard, that appears more frequently with 64 bit system.
When that appears on closing ubuntu splashscreen appears on many little square

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xinput 1.5.3-2ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Wed Jan 4 02:46:00 2012
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
SourcePackage: xinput
UpgradeStatus: No upgrade log present (probably fresh install)