Toshiba Satellite M35X, A70 or A75 locks up, freezes up or reboots when you touch the laptop speakers

If you own a Toshiba Satellite M35X, A70 or A75 laptop then you can experience the following problem. You laptop might lock up, freeze up or even reboot by itself when you touch the palm rest around the speakers area. It happens because of a static electricity discharge when your touch the laptop speakers. In some cases you will not even fill that discharge. The problem occurs because of improperly grounded top cover assembly. To fix the problem, it is necessary to install a new modified top cover assembly. If you laptop was made before January 2005 then most likely you have unmodified top cover. For example, I made some pictures from a Toshiba Satellite A75 top cover assembly. The top cover for Toshiba Satellite M35X is almost identical.

On these pictures you see unmodified top cover assembly for Toshiba Satellite A75. The foil runs from the speaker and from the touchpad to the metal chassis.

On these pictures you see a modified top cover assembly. The foil runs from the speaker and the touchpad, touches the metal chassis and ends on a screw stud.

On this picture I remove the metal bracket, so you can see where the foil tape is connected.

I think it is possible to make this modification yourself. All you need is to find a foil and run it as it shown on the pictures. I have never done it myself, so not sure about the result.
Here are some other problems found in these models.

Power jack issues: Toshiba Satellite M35X and Satellite A75 power jack and battery charge problem
Overheating: Why my Toshiba laptop suddenly shuts down by itself without warning?