In the XFi app we are seeing permanently devices connected and connecting to our network that are not ours. We have passwords set to none standard.
Their Advanced Security feature has recently been pushed to their gateway devices via a firmware update whether you want it or not, hence the hypochondriac notices. It's buggy.
We've seen many many posts about this here lately ! The work-around is to disable the Advanced Security and not use it for now, it's buggy.;