It turns out that there was some maintenance on the tower nearby which caused the Electrons to stop talking to our server.
We are actually using a hard coded IP address so it isn’t a DNS issue. It had to be a routing issue of some sort.
We have had this happen again in 2 different locations. After the above incident, we added the capability for the device to reset if it hadn’t contacted the server. That hasn’t worked as expected.
We are looking at other fixes to the problem and trying to get a detailed description of the maintenance performed in an attempt to resolve the issue.