Please let support know - this is the first I’m hearing of this problem. We are going to need poller access to troubleshoot this so it’s not going to be something suitable for a forum thread.
Edit: Checked with Alex, looks like there was an emergency Ubuntu security patch that might be the culprit here. Do an
apt-get update then
apt-get upgrade then a reboot, and it seems to have fixed it for the couple that have contacted support about this.