Fail To Accelerate problems of the 2010 Nissan Maxima

Nissan Maxima 2010 - sport edition. The cvt transmission exhibits severe lose of power on 75mph roadway driving between phoenix and flagstaff arizona, up elevation. Lack of power is present in heavy traffic as well. On 75 mph highways the cvt begins to whine, the engine has high rpm, loud whining noise from cvt, and car gets stuck in 6th gear in both manual shift mode and drive mode. The vehicle will not accelerate or maintain speed with other vehicles at the posted 75 mph speed limit. The vehicle will not give a code but once gave a p1778 code - faulty solenoid or step up motor. This issue occurs frequently within city driving as well, in addition to high speed highways on long drives over hilly roads climbing up elevation. In city driving the cvt will not respond when the gas pedal is depressed leaving the vehicle in the center of traffic when entering a busy highway. At other times the vehicle is able to accelerate dramatically (normal) to the speed of cars on a busy main street (55mph). And, then suddenly the car just lacks power when entering a busy 3-4 lane street (55 mph) and you find yourself in the middle of busy 3-4 lane street with approaching oncoming traffic. The vehicle is barely able to get itself out of the way at full throttle. The problem has been getting progressively worst and did not occur when the car was purchased new. Cvt fluid was changed at 44,000 miles prior to Nissan recommendation. This cvt transmission sucks and the dealerships are giving customers a hard time since the problem doesn't not give a engine trouble code. The code p1778 eventually is cleared from the computer on its own when it does occur. The problem with this cvt transmission persists and is a major safety issue because the vehicle will suddenly fail to accelerate and maintain the posted speed limit during city driving and on high speed highways.