First hand experience - Nissan Altima SL 2008; bought brand new. Had 135k miles and it's transmission died last month. Trans repair from the dealership is $4500 all in with only a 12-month/12k miles warranty, so basically useless.
Another case - my BIL had a 2016 Altima with 65k miles, had the same issue in July.
I researched about the issue and the internet has hundreds of complaints of failed transmission on the Altima. Basically CVT doesn't last long and they don't make them good anymore.