On / Off

good afternoon, I buy 12 pro max, but he has one problem, when the phone is turned on, the apple lights up for a couple of seconds, then it goes out and only on the second attempt the phone turns on, I went to the vodafone where I buy this phone, they offered to give it to them for repairs at two weeks, but I don't have time to wait that long! is this problem with the phone itself? or it will be eliminated with the release of ios