Nissan Liberty CVT .
 

I have recently purchased this vehicle. On occasions the Variable Transmission appears to have very little drive. Just revving of the engine and not much movement. Once up to a greater speed it would appear to start selecting correctly.
Most times the CVT works as specified. Does anybody have experience of the problem, something sticking ? What to do ?
The vehicle is not supported in Zimbabwe, it is termed as a "grey Import"