Question How should I troubleshoot this BSOD with message: "WHEA uncorrectable error" and inability to boot?

[Cinders1]

My machine started freezing, throwing a BSOD with message "WHEA uncorrectable error" (or just restart suddenly) and would usually be unable to boot for a bit, BIOS would show no bootable drives. If I waited awhile, it would boot again. Problem got worse over time, and it seemed to occur mostly when there was a lot of reading activity on my my main M2 SSD drive. So, I thought the drive was failing. Got a new drive, installed windows on the new M2 SSD drive in another M2 slot, and it seemed to work. But then I tried accessing the old drive to get some files off it, and it immediately froze and gave the same BSOD. I waited awhile, and tried to boot it up and again there were no bootable drives. The BIOS could see my new drive but didn't register it as bootable despite having booted from it earlier. I tried using the "repair windows" option from the windows install usb, and it said it could not be repaired. I then tried using the system backup function from that same usb, (I had a backup on a HDD storage drive), which worked and now the machine seems to be running normally. I have since physically removed the old drive.

I could wait and see if it fails again, but any thoughts on what the cause is?
It seems the old drive was breaking everything when accessed, but I cant figure out how faulty drive A could corrupt windows on new drive B just by trying to access it. Or is that possible?
Is it possible it wasn't the drive, but the M2 slot it was plugged into?
Is it something else, and its just coincidence that it works now? My next guess would be the mobo itself.
I'm happy to run addition checks, just want to have some ideas if I suddenly lose my machine again.

Some basic system info:
OS: Windows 10 pro
Processor: AMD Ryzen 7 3800X 8-Core Processor, 3893 Mhz, 8 Core(s), 16 Logical Processor(s)
BIOS Version/Date: American Megatrends Inc. 1405, 11/19/2019
BaseBoard Product: TUF GAMING X570-PLUS (WI-FI)
Installed RAM: 32.0 GB
GPU: NVIDIA GeForce 2070 Super

Edit: Added GPU, PSU is hard to get to. If the problem persists I will get the info but I don't believe its a power issue.

 

[Lutfij]

BIOS Version/Date: American Megatrends Inc. 1405, 11/19/2019
BaseBoard Product: TUF GAMING X570-PLUS (WI-FI)
https://www.asus.com/bd/motherboard...sk_bios?model2Name=TUF-GAMING-X570-PLUS-WI-FI
You have a number of BIOS version pending update.

Your specs are incomplete as well. Please mention the make and model of your PSU and it's age as well as the discrete GPU you're working with and your storage options.

 

[ubuysa]

The faulty drive had a Windows system installed on it. When you plugged it in you had two Windows system drives installed, that's likely what caused the new drive WIndows system to become corrupted.,....

Junk the faulty drive, they are not repairable, and clean install Windows on the new drive. Forget trying to get your data off the faulty drive, it's likely gone. When using SSDs it is absolutely essential to take regular backups.