Why does computer restart some times after contact near USB stick/cable?

Hello,

I own a desktop with 2 USB ports at the front side, which is terrifically usefull. But some times, when I touch the USB stick to the USB port, the computer restarts immidiatelly. I suspect that there is some static electric discharge from the stick to the port or vice versa which make the computer to restart. Can you think of what can I do to prevent this from taking place?

Note that this doesn't happen every time.

Why does computer restart some times after contact near USB stick/cable?

If the USB ports surrounded by the back do like thing it's probably your power supply - it may not be powerful ample. It may need to be upgraded to bar the additional power requests.
i've seen that within many computers that there's problem contained by the USB port in the front side.

try using the USB port within the back specifically directly connected to your motherboard. this might help.