Interesting. You don't say what version of Lightroom you are using. Please make sure you have Lightroom 6.10 or Lightroom CC 2015.10.
Also please make sure that your video card driver is up to date.
Yes, I have checked both of those and everything is fully up-to-date.
Mine is the CC version
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This sounds more like some type of hardware glitch.
Run Memtest 86 overnight to stress and test the memory.
On your SSD open the Properties window then the Security tab and make sure your user name is added to the ROOT of the C drive and give it full control.
Also check your username folder, C:\Users\YourUserName for those same permissions, IE Full Control, on the security tab of the Properties dialog.
If this is a desktop system go into the Advanced Power options and set the system to run at Max Performance. There is also settings in the BIOS/EFI for limiting the CPU speed. Try turning those off and or Full Power.
If this is on a notebook you might be stuck with the Intel Speed step settings or having shorter battery life.
Thank you Just Shoot Me, we might have a problem here!
I found I wasn't listed, but the admin group is (and I'm in it):
Should I add myself individually? I did try that but got a load of error messages saying it couldn't enumerate certain folders.
My user folder does have full Control.
I have the power settings on high performance now but they only seem to influence sleep etc.
Yes add your username to the list and give it full control.
But do not go Advanced and do anything else.
In the Power Options section there is a link to Advanced Power Options.
In Control Panel (NOT PC Settings) Find the Power options icon then open it. Under High Performance click the Change Plan Settings link. Then the Change advanced power settings link.
Set the Hard drive to Never (you have to type it in). Check all other settings and if they are limiting the system set them to either never or disabled.
My screen shots are from a Virtual Machine of Windows 10 as I run win 7 Pro. So your's may look a little different.
With my system, which is 6 years old, I have no freezing or slow downs when using LR or any software. But I have every power limiting feature turned off. And I over clock my system.
Right just click continue. There are some folder and files you can't add your username to, which is OK. That's why I said NOT to go to the Advanced section and try to do that.
Clicking Continue will just skip that folder.
Did that instinctively but at the end the last message is about C:\ and then it says it was unable to perform the action.