Go back to service centre to claim for warranty. It's a known issue.

I'm still waiting for the spare part to arrive.

yameh....if lens dirty what shud i do...i also cannot open to clean myself right 
hey...i also got the same problem....sometimes must press many many times only can go down a little bit

If it's within the warranty, you can claim it. Your case is the control on the driver side or passenger side?

Mine happened on the driver side which is called as master control switch. It's my second time!

u tak cakap, tak notice la..
but i tot shud follow the previous thread?
hmm...
same here..
sometimes mood ok..
can wind down and up.. but not smooth lor.. like no minyak..
erm.. claim for warranty better then diy..
nvr diy when got warranty..
after diy they would say u make it spoil...
happen to my friend..
so warranty only up till his 4th service.. go outside service..
then he go mod his car..
mod till kow kow..
then his car now one of the list of missing car in msia,
he cry kow kow..

any1 got heard of secure lite???
the agent said is from Vkool, is it true??

btw, how to looks for car what year it manufactured???