I'll update again - general answers to everyone here.
Highly doubt the problem goes away with replacements. Its been tried by multiple people including me (doesn't matter the config: i5, i7, 8GB Ram, 16GB ram) all have the same issue.
Also, there is a strong possibility that Microsoft may have not done a good job in "charging" department - 85% of cases are when they are connected to docks, chargers, etc, (I tried multiple chargers, multiple docks - dell and Microsoft docks, etc) Try this:
use an external screen, or multiple screens - use moderate load apps/games - Do not charge or connect to dock - Are you still buzzing and electricity static noise? (you you keep your ear close to the back of power button) - If not, its charging issue - My
current battery life is only giving me 3 to 4 hours tops. I have cooked it enough to a point battery is already giving up, and who uses laptops without charging all the time? to me its not a workaround - or a fix. I also strongly believe this cannot be fixed
by an update (there are ways to fix this may be using a software patch - that is when Microsoft pays attention)
The one thing interesting, I haven't tried is MacBook charger as - again not a workaround, we expect quality with premium prices.
Microsoft insists no one approached them with this problem- or they haven't heard of this issue? "well there are 14 pages here which suggest otherwise
If anyone is keen to know the temperatures and more hardware details of your laptop - I'd suggest installing a small piece of software: "HWiNFO64" you can monitor live temperatures, RAM, CPU usage in good detail.
I am yet to go to Microsoft store for them to test it - I may have to leave it with them for a week or so... With this Carona (COVID-19) situation in Sydney. it's not worth it for me as I'm still using this laptop pretty heavily for work.
Stay safe people.