fixed by https://github.com/operator-framework/operator-lifecycle-manager/pull/649
After increase cpu and memory size, controller pod becomes more stable.
$ oc get deployment apiserver -o yaml
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.