It doesn't necessarily have to be a lemon. In my case, for instance, the first one I returned was because, within 24 hours, it had three kernel panics. It was right before 10.15.4 came out and reports were that, for some people, the logic board was at fault and needed to be replaced. I do not know whether mine was in the same boat or not but, I was not willing to send in for repairs a brand new unit. So, I returned it and reordered.