Change your transmission oil it happen to me . And have your mechanic check the transmission you might have metal shavings in the transmission which is really bad.
Because reverse is a lower ratio gear than drive and puts less load on the engine.
You have to get the engine looked at.
The 2013 Infiniti QX has rear wheel drive.
The 2013 Infiniti JX has front wheel drive.
The 2012 Infiniti M has rear wheel drive.
The 2011 Infiniti EX has rear wheel drive.
The 2012 Infiniti FX has rear wheel drive.
The 2014 Infiniti QX70 has rear wheel drive.
The 2011 Infiniti FX has rear wheel drive.
The 2013 Infiniti EX has rear wheel drive.
The 2012 Infiniti EX has rear wheel drive.
The 2012 Infiniti QX has rear wheel drive.