Alright, well I managed to get it reconnected. Had to reset the AT&T gateway completely back to defaults and then reconfigure everything, but at least it’s reconnected now.
I’ve still got the incorrect data issue, but maybe it’ll figure out how to correct it eventually? I’m hesitant to ask support to try fix it, considering I did that last week and it still screwed up yesterday anyway…
In case it yields any increase in collective knowledge, here’s a screenshot from the app; the message showed up concurrent with the readings going incorrect again.
