I have the same drive shaft problem of ketat ketat sound like you all. After I did wheel balancing and alignment  by Perodua dealer. There is no more sound, may be a little bit, very minor. Perodua Service Centre says they will replace a new drive shaft for me under warranty. I just wonder how the mechanic judge correctly or not.

my wife viva elite have the same problem....

1) drive shaft "kakaka" sound when slowing down
2) dashboard nearby the glove box there got rattling sound when idling...
3) rear left side abs got "kruk" sound when going over uneven road
4) when brake apply..got rattling sound at caliper there
5) when turn on the car headlamp...radio giving whistle sound upon accelerating...

all the problem above solve except for no 2...

1) change new drive shaft..waited for 2 months...using for a year now...
2)they claim the screw to hold the ECU to the mounting loose..but they tighten ady still got sound after few weeks....its been a year ady too...
3)change only 1 side of the abs...causing the other side got"kruk" sound ady
4)change the brake caliper pin..
5)change new radio....

my wife car warranty is 7 years....

I tell you what..u go to perodua website and email them under the complain...your complain will reach to HQ...HQ people will call you...you then direct deal will HQ people...push and pressure them...it took 1 week to complain and 2 months for the claim...after that...all my wife viva claim for warranty is extreme fast..like got VIP treatment...FYI my wife viva service at Taman Bahagia PJ branch....u go there and ask for Bryan...