How many nodes you have in this vSZ cluster? Is it thick or thin provisioning?
Make sure you have allocated recommended hardware resource level.
If everything looks good and you are still facing the issue then report it to support.
Syamantak Omer | Community moderator | Staff TSE | CWNA | CCNA | RASZA | RICXI | Follow me at https://linkedin.com/in/syamantak-omer-5949b6124