That sounds good. What follows is my opinion. This does not represent the forum administration.
You have a window of opportunity to return the device to the vendor. The longer you wait, your credibility becomes less. It should not show that kind of behavior. Although your computer is suspect, it is not certain that it is at fault. Any attempt to repair or modify your computer puts a burden on you and your resources. Here is your chance to reduce any more loss by returning it for exchange or refund.
There is a factual basis for this opinion. A report I read said almost 50% of 'failed' hard drives were in fact not defective. However, retail merchants and their suppliers accept this as part of their responsibility to serve their customers. But with a strict time limit. In some areas the unconditional return privilege is limited to as little as 15 days.
My recombination is to take it back. And yes, there is a possibility that the unit has some sort of defect. Odds are 50% you have reason to declare it defective. Go for it!