Forum Discussion
ReFS filesystem not responding periodically
(https://docs.microsoft.com/en-us/answers/questions/704549/refs-filesystem-not-responding-periodically.html) Storage spaces, Simple (no parity), Thin provisioning Virtual disk larger than 100 TB, ...
I don't know how to create a support ticket. Via the 'Get Help' app?
I think you can try https://support.serviceshub.microsoft.com/supportforbusiness , but if you have a Microsoft Partner (For licensing etc.) you could ask them?