I think this wasn't a problem of the remoterig boxes. I had some of them running in a permanent link over weeks, no interruptions, no fadeouts of connection. Most of the problems are caused by the internet itself or access-gear like modems or routers. Nevertheless I would never suggest to base emergency relevant communications on internet-links only. They are to much dependable of an undamaged and running public infrastructure eg. electricity, wiring, internet providers and net load could also be a problem in emergency situations.
73 de Mark, HB9AZT