Thank you for your effort, however, unfortunately in my case the disk shows no errors on a first ‘Data Lifeguard Diagnostic for Windows’ extended test, or on multiple quick tests. I don’t believe erasing this brand new disk with no reported physical errors will help in my case.
The issue is definitely something to be concerned about, as whilst it is happening, which can be seen when it shows 100% Active Time and Zero Data transfer in Windows Task Manager, it is unusable as it is extremely slow to even access and intermittently disappears from Windows 10 completely! So I would say it is not so much a concern, but rather a problem where the disk is not useable or reliable.
The SATA controller, cables and ports have been tested and confirmed as working.