Question Toshiba Satellite c855 113 restarting when typing or when pressure is applied on palmrest

Sounds a lot like you have a loose connection inside. Depending on if it happens when on charger or battery (or both) could make a difference as well.

The only way to know what it is for certain is to open it up. If it is under warranty, I would contact the manufacturer about a repair. If it isn't, then a local tech should be able to fix the issue.
 
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