My 2015 Mazda BT-50 starts to drop back from 6th gear to 5th on a slight incline on the road when it would not usually happen. Then it starts to loose power and goes into like a limp mode. This happens when highway driving from 200 to 300 km. No warning lights are displayed. If you leave it turned off for a few hours or overnight it’s right to go again. You can drive around town all day. No problem.