Hmmm...I don't know about that, I'd say that if the router reset itself to factory settings, then all the port forwarding, DDNS etc. would also fail, which is not the case here. Which makes me believe that either:
1. Texecom panel [or comIP module] changed something by itself (which according to the thread above doesn't seem to be impossible), and/or
2. there's malfunction in the app itself [that might have come alive with one of the iOS 11 updates], and/or
3. alternatively issues with texecom servers perhaps?
I'll have some time to look into it tomorrow, however I wanted to see if anybody else might have had similar issues, so I don't spend better part of the day messing around needlessly.