There may be a 2014 Altima out there that has a problem with the CVT. However, it isn’t your Altima, so I would keep on driving down the road and not worry about it. Follow the service intervals recommended in the owner’s manual and drive on.
As an analogy, I was once assigned to teach a class of 200 elementary education majors in a course designed to give them some computer skills. Of the 200 students, four of the students went to the administration and complained that I was too demanding in what I required of the students in the course. I was called in by some administrator and told that there were complaints. When I found out that the complaints came from 4 students, I asked the administrator to check with the other 196 students. The 4 students weren’t turning in the assignments while the other 196 were doing their assignments. The administrator said he didn’t have time to check with the other students. I retorted that I didn’t set the curriculum for the class based on what 4 students thought the content of the course should be and stormed out of the administrator’s office. Think about your Altima. There are probably hundreds of Altimas running up and down the road with no CVT problems. Perhaps the few that had transmission problems weren’t maintained or driven hard just as the 4 students that complained about me were lazy and skipped class frequently. Drive on and don’t worry.