Replaced HD, now PC unstable

[DaveRMSM]

Hi

I have a 4 year old work PC (Windows 10, Intel i5 9600K, ASUS Prime Z370-P II Motherboard & 32GB 3200MHz Corsair DDR4 RAM, Gigabyte Aorus GeForce GTX 1660 OC 6G) which I just replaced the Samsung 250GB SSD drive with a new Samsung 870QVO 1TB one because it was out of space.
I did using MiniTool Partition Wizard to copy all the data over, then switched the boot drive in the BIOS. I did this on another PC and it works fine.

The PC boots fine and I can start work, but after a while (can be up to 2 hrs) it becomes unstable, Chrome crashes, the screens can flicker on/off and messages about out of memory etc.
I installed Samsung Magician and ran diagnostics on the new drive, performance benchmarking and it seems ok. I also installed another tool and tested CPU and RAM and seems ok.

What else can I try?

Thanks
Dave

 

[Tetras]

Copying an install over doesn't always go swimmingly, how easy would it be to copy your data and settings over to another drive and do a fresh install?

 

[Fluffybob]

Better practice to backup your data from the old drive and do a fresh install imo.

 

[Zaphan58]

I've never had success cloning to a new drive and always wipe and start a fresh.

 

[DaveRMSM]

Thanks guys, I will start afresh

 

[Zeebedy]

fresh start always best practice.