If you you can recreate this issue by applying pressure on the front end of the notebook can you up load a video of the re creation, this would be very helpful.
Try removing the Hard Drive from Bay 1 directly under the touch pad to Bay 2 away from the touch pad. The hard drives close proximity may be causing problems with the touch pad.
Temperature may also be causing the touch pad issue, try running the notebook in a cooler enviroment and again in a warmer enviroment to see if the issue is exacerbated by temperature.
I have heard from some useres that running Moodpad- in the background can resolve their issues *note this might not solve your problem
moodpad is available here:
http://itunes.apple.com/us/app/a-mood-pad-heat-sensitive/id314162903?mt=8Some useres have expressed that putting pressure on the touch pad when it is acting up can temporarily make it go away.
Adjusting the Touch Pad settings like disabling edgemotion, gestures, multifinger tapping, horizontal scrolling and zoom function may resolve some of your issues, open the Synaptics Pointing Device manager in the taskbar. open the Device Settings tab, highlight the Touchpad entry, then click on Edit.
Use the most up to date Touch Pad drivers currently at version 15.1.16.2
Update your video drivers to the latest version
Make Sure you have updated your Vbios to the latest version, there is a step by step guide available here:
http://www.asusrog.com/forums/showthread.php?519-G73Jh-GSOD-Vbios-UpdateAlso checkto see if your BIOS is up to date the current BIOS version is version 0211
If it is a hardware issue with the touch pad contact tech support, request an RMA and specifically make note that you wish to have the touch pad replaced due to the intermitant nature of the problem.
I have created a Sticky Thread for troubleshooting the touchpad issues available here: http://www.asusrog.com/forums/showthread.php?883-Troubleshooting-ASUS-G73-Touchpad-Problems