My unit wont last for 48 hrs... maybe need use several days ...

glad that solve your problem....
ya... but unauthorize flashing fw will void warranty i think.

Very true - I had claim successfully with Knox tripped 3X. Two times I send in personally while the 3rd time was through a collection center in BP. The guy in charge even advise me to unroot it properly and that Knox was unimportant too.  The important thing is the phone must be fully unrooted and devise status must be back to official. One can unroot through the app SuperSU at its settings or a longer tedious way is to re flash official firmware using Odin in PC

I also just received call from SC. My new replacement is ready for collection.. wee.. this is fast!!

I send in on Sunday evening.

Let me update my case also

Finally i got my replacement unit yesterday.

when on the way home, i receive a call from samsung SC @ the mines. he inform me my note 7 replacement unit are ready to collect.
go back home after dinner rush to the mines service center to collect my phone.

after that i straight away update the latest firmware, do factory reset (lucky everything go smooth) and now my
Phone seems fine and smooth, no lags no freeze and no restart. Will keep testing and keep monitor.

thanks for samsung for the fast action.

Update:

After home with the new replacement set, i updated the newest firmware (the 180mb updates) then proceed with full factory reset. After that only do minimal transfer thru smart switch (sms,  call logs etc only).
All apps fresh installed.
Security features all done setup.

Phone seems fine and smooth like jelly,  no lags no freeze no restart. Will keep testing and keep monitor.

My replacement phone was manufactured on 18aug2016 according to SammMobile info,  as screenshot attached.

P/s: im so darn tired yet happy that my super note7 is back finally!!!

Updated the latest update on my phone. Phone working fine as usual. Btw, my phone is manufactured on 14/8/16.

my phone manufacturing date : 04/08/2016.   

[attachmentid=7386475]

Yup. at first i didnt check on the manufacturing date. but never mind as long as it didnt give me trouble then consider good already. 

Could be celcom signal weak in my area causing battery drain even at idle
But SOT (QHD 1440x2560) is very good despite having 100mAh less than s7 edge

The f**ked up thing is they didn't give any kind of service order.

Contact samsung Hq, but they can't check the status with service order number.