I've had this problem for a while. It seems to take place when I'm doing multiple things such as transferring files, copying big files etc. simultaneously.
Still searching for an answer but I suspect it's because the CPU is too busy.
If you get really fed up with it try:
CTRL+alt+del
Task manager
scroll down to the yellow icon of windows explorer and click re-start.
There is then a pause and wondows file explorer comes back and works normally - for a while at least.
Not sure why this happens.
If for example I'm moving 30Gb of pictures to my back-up hard drive, it tends to happen.
Maybe I'm just expecting too much from my pc.
The human brain is after all so much more complex than AI and we can cope with massive multi-tasking but maybe the trouble is that AI has a finite limit - unless you place unlimited resources in your machine.