possible problem

What is your question?

2012 Nissan Maxima would not start. Took to the dealer and told I needed a new alternator. Alternator was replaced. Picked up from dealership and loss power on the highway after I left the dealership going 60 mph and had to be towed back to the dealership. This time iI was told it was the battery cable. Battery had already been replaced. Four weeks later traveling on 95 the exact same thing happened. The dealership says they can't find anything wrong. Something is dangerously wrong when a car just loses power and shut down on highway.

What makes this problem better or worse?

both times driving at night on highway

How long has your 2012 Nissan Maxima had this problem?

1 month