4.26 is locking up

If I move assets in the content browser 4.26 locks up at that point the program will not respond to kill from the task manager or from an admin command prompt. The only recovery is a reboot. This happens when moving large folders usually sound folders. The process seems to complete all the steps - moving - cleaning up - unloading but then the program locks sometimes with a large amount of ram in use but sometimes as low as 2gb. This ws has 128 gb ram so its not running low.
Here are the specs
MB trx40-xe gaming
BIOS AMI 1502 (latest available 7/13/21)
CPU threadripper 3960x
OS Win 10 pro
RAM 128 gb DDR4 3200(PC4-25600)

The task manager reports -
UE4 Editor Not Responding CPU 0%
Then 2 unnamed processes not responding
Then Unreal Editor not responding
Then content browser not responding

my folder setup is
_FX
_Mannequin
_NPC
_Sound_Music
_StaticMesh
DazToUnreal

The latest lock up is when moving the HumanVocalizations pack
Suggestions?

Thanks
WD