Allowing vsphere volumes to have mutliattach capability (concurrently attached to multiple nodes) causes several stability problems - https://github.com/kubernetes/kubernetes/pull/67825
https://github.com/openshift/ose/pull/1442
Checked again with OCP v3.9.68, the issue are not reproduced.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2019:0331