LinuxQuestions.org - weird mouse problem

I have a weird and very! annoying mouse problem. While in dropline the mouse curser goes crazy, it moves all over the screen, minimises things, changes windows. It even does this while I am not even touching the mouse. It only does it 5% of the time, however its a big problems as I am finding that it fully disruptes what I am doing. Any help would be great.
Cheers
my specs are;
Mouse: logitech ps2 mouse w wheel
kernel: 2.6.7
Dl: 2.8 (latest)
and a section form

Code:

# **********************************************************************

# Core Pointer's InputDevice section

# **********************************************************************



Section"InputDevice"



# Identifier and driver



    Identifier  "Mouse1"

    Driver      "mouse"



# On platforms where PnP mouse detection is supported the following

# protocol setting can be used when using a newer PnP mouse:



#    Option    "Protocol"      "IMPS/2"



# The available mouse protocols types that you can set below are:

#    Auto BusMouse GlidePoint GlidePointPS/2 IntelliMouse IMPS/2

#    Logitech Microsoft MMHitTab MMSeries Mouseman MouseManPlusPS/2

#    MouseSystems NetMousePS/2 NetScrollPS/2 OSMouse PS/2 SysMouse

#    ThinkingMouse ThinkingMousePS/2 Xqueue

    Option "Protocol"    "IMPS/2"



# The mouse device.  The device is normally set to /dev/mouse,

# which is usually a symbolic link to the real device.



    Option "Device"      "/dev/mouse"

#    Option "Device"      "/dev/psaux"

#  Option "Device"      "/dev/ttyS0"

#  Option "Device"      "/dev/ttyS1"



# When using XQUEUE, comment out the above two lines, and uncomment

# the following line.



#    Option "Protocol"  "Xqueue"



    Option "Buttons"          "5"

    Option "ZAxisMapping"      "4 5"





EndSection