Since the last MainWP update I have a website that disconnects, which never disconnected before. Nothing changed on our side or the hosting. The error we get is : Public key already set. Please deactivate & reactivate the MainWP Child plugin on the child site and try again. (doing this does not help)
Got it working again, but not sure what was the issue.
I deleted the plugin from FTP and reuploaded the files. Then I deactivated and reactivated the plugin.
And then i was able to reconnect.