Hi,
Did support solved your issue? I’m having the same problem. It also doesn’t concern any specific application. System hangs randomly for 30sec up to 1min. The only difference I have is Windows 10 (10.0.14393) and that system is responsive during 100% disk usage. However most appliactions does not work at all on that time.
I’ve made a screenshot (attached). As you can see when there is 100% of usage, all transfers on disk are droped down to 0.
BR,
szyb