Transmission Slip Out Of Gear problems of the 2016 Mazda MX5

Vehicle spontaneously jumps out of 4th gear into neutral at highways speed. This will typically happen on a moderately steep downward grade (e. G. California highyway 17 between sugarloaf road and glenwood cutoff heading towards san jose, or the curve known as the "valley surprise" just past summit road and highway 17 intersection) as the vehicle slows and engine braking kicks in. Steps to reproduce: place vehicle in 4th gear. Drive at approximately 60 miles per hour. On downhill grade back off accelerator as engine braking begins the vehicle spontaneously jumps into neutral. This happens repeatedly and reproducibly. Vehicle is under Mazda warranty. Date is just an indication. The fault occurs daily.