The problem in pakistan is that peaople think if they had changed the ATF. (drained and refill) then it can last for dacades and donot follow the proper flush procedure then the damn valve body assy doesnt work properly and result in stress full drive which results in Different Symptoms le ATF over heating issue, improper Gear shifting, different noises like mentioned above and also different humming noises. So on first hand no one does any ustaddi to these vehicles as if they see the valve body assy they think that is from mars and servicing it will result in big blast and other thing so they ate limited to just servicing the oil induction filter. Thats it. But in these behicles cases they are equipped with accumulators pistons for diffrent purposes which had Rubber Seal Ribgs which worn out due to improper maintance and results in above mentioned problems so they need to be treated before damages start to grow more larger. The new cvt's gear boxes are state of the art technology but again here in pakistan no proper service procedure is followed. I had personally serviced these valve body assys and the end resulta are more than which we expected..