Repeat Errors Samsung S6 Edge

a little over a month ago my phone had issues where it overheated badly, so much so that I could barely hold it in my hand. After a struggle and a complaint they had given me a \new"phone(So they say) but then I checked that it was an older built than the previous one I had. I didn't see this as a big problem and took it. <br> <br> The same thing"