Shaking Under Acceleration? (CVT K11)

Hi guys. I have a weird issue with my car. Unsure where to look first.
I have a micra k11 with the CVT box, I drive very very frequently and like to think if anything was ready to break id have seen it coming. But as I drove 70mph on the motorway my car started having jumpy acceleration and slowing down. Eventually I managed to get it moving at very low throttle. Until it decided to cut out the engine. The car will start fine. And appear to go into drive and reverse just fine. In neutral the engine is very healthy. I checked my transmission fluid. Level could be SLIGHTLY higher, but the colour had slowly lost its pinky hue. Im hoping that the fluid may be old and id just need to do a trans oil change. Does anyone have any ideas?
 
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