thanks for the info. dell retailer ya?

maybe I will try asking some shops I can found here.

http://www.dell.com/learn/my/en/mydhs1/cam...il-page-my-main

in my case my institution has a volume licensing agreement with microsoft, so we can use unlimited copies of windows

Look at the price vs spec

Problem to the mom board.
Still faulty after replacing a new board then I requested to stop repairing and give me a 1 to 1.
They accepted it with no rejection, isn't cool.....

The replacement unit works great, I am making this post with it. 

I took the UHD ver. at RM4,499. The exact amt is actually slightly cheaper. Pls dunt ask me why, I have no idea 

Built quality - Good. Rubbery palm rest is ok to me(personal preference). Feel lot more solid than my old plasticky Latitude.
Charging now from 42%, take 1 hour to full charge.
Screen brightness - good to me.
Screen quality - sweet.....
Screen clarity - Everything is good except the Ads beside Lyn forum looks readable blurry, it might due to the 4k display. Wording in the post is blardy sharp.
Touch Screen - Responsive.
Scale - No problem, it's adjustable.
Keyboard - better than low/mid spec. laptop. Layout is good too.
Wifi - full bar all the time, no fluctuation at all.
Touchpad - Indeed it's loose, I will say it's meant to be that way, not a defect, it's acceptable. Sensitivity good to me.
Audio - Clean & very Powerful!

What else?

tried it a lot times to download stuff before I sleep, no such issue
just make sure your power option > plugged in column put the compute to sleep change to never

only during midnight ? how about normal usage during non midnight time ?
btw try check your intel driver and nvidia driver version, and list them here