Since Windows 10 v2004 isn't Insider Preview any more, I would like to say: I do have the issue as well. Independently whether installed as up(g/d)a(d/t)e on the same machine or fresh install. Randomly but consequently, Windows hangs, as it didn't do before
over the past year.
I found it is always something Windows Explorer causes - since drivers, independently of which device and independently whether MS or manufacturer provided, are still working whilst Windows Explorer just takes its '5 minutes' and more to do ??? and than
works for a while again.
If the system is fresh booted, this behavior happens around an 1h later the first time, independently on what I am doing on the device. After a day or two not rebooted, every 10 Minutes I have some coffee minutes to take.
I also found that, if I am not working with virtual desktops - which are kind of broken since Windows 10 v2004 anyways - and deleted all of them, I can work smoothly over the coming days - however, even with 4 physical monitors, I need those virtual desktops
since resources don't allow me right now to compensate with more physical hardware.
So I don't know if this is leading in the right direction in terms of fixing the freezing issue - but at least I do have a work around in my case which isn't good but working.
I have also complete VS2019 development stack, diverse other development software, O365 and more installed. If I am installing a previous Windows 10 version with identical software stack (thanks to WDS ;)) and with most recent drivers etc., everything is
smoothly working, even with all updates except the 2004 upgrade.
Hence I am pretty sure, the issue came with 2004.
In terms of used hardware, just in case that indicates something in addition (not overclocked):
Threadripper 1950x
128GB DDR4 RAM
Radeon Vega 65
M.2 2TB Samsung SSD Pro
Raidcontroller with Expansion, 10 Hdd + 6 SSD + ...)
Displays: 3x 1920*1080 (DisplayPort) + 1x 2560x1440 (HDR / HDMI)
10GB Asus NIC + 1GB on Board NIC (ASUS Prime x399-a)
Average all system + components temperature: ~50C, in current summer time: 55C.