Samsung Sold us a Faulty Product Nationwide

We purchased the Galaxy Note Pro 12, four months ago.  Since we have purchased it, it will turn off during use.  (At a full charge.)  In the first few months, it woud eventually turn back on after an hour or so.  In the last month, it will turn off, and not turn back on.  We have sent the product to Samung for repair two times, each time they say that there is nothing wrong.  We recently go the tablet back, and it turned off again.  We called Samsung, and they want us to send it back in for repair.  They have stated that there is nothing they can do in means of replacing the item.  Our only choice is to continue to send it in for repair.  The warranty on this product is only a year, so what happens when that time runs out?  We just have a tablet, that we spent over $800 on that doesn't work?  There must be a better solution.