Can't reproduce the Ramrod failure issue using the following reproducer --- zero out of 2000+ start/stop OVS.

*** Reproducicer ***
Install OVS-2.12.0-21
start the service
configure a OVS-dpdk bridge with qede dpdk interfaces
while [ 1 ]; do date; systemctl stop openvswitch; sleep 3; systemctl start openvswitch; ovs-vsctl show; done > ovs_start_stop.log 2>&1 &

[root@netqe10 jhsiao]# rpm -q openvswitch2.12
openvswitch2.12-2.12.0-21.el8fdp.x86_64
[root@netqe10 jhsiao]# uname -r
4.18.0-147.el8.x86_64
[root@netqe10 jhsiao]#

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-2020:0745