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Computer turning off and on, on its own....

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Does your computer have frontpanel pushbuttons that are linked to the motherboard via slide-on printconnectors ?

Does your computer have any kind of infrared eye like for a remote control ?

What you need to look at is if the lines to the RESET button are connected to the proper printconnector pins, and you need to check if the reset button smoothly glides into the surrounding frame of the cabinet. If it sticks or sits cramped in, it could generate false contacts.

This reset signal being at the TTL logic level in terms of current and voltage, could also be triggered if an infrared detector eye would receive any IR light.