honda jazz automatic jerking?

My automatic Jazz jerks/shudders while accelerating (mostly at lower speeds) & when slowing down exiting a highway. It has cut out on me twice, then i have to turn the ignition off & it usually starts again. Lately the car also sounds like the accelerator is sticking & the car will rev quite high. It has been on 3 diagnostic machines without any errors, we have serviced it & replaced the crank angle position sensor.....but it hasn't helped! I took it to Honda & the mechanic who test drove it said it needs a CVT flush (gearbox oil change) this has also been done, but without burning the clutch like he recommended. Please help, we have spent almost R4000 now!!