I have the same exact problem. I have noticed that the devices become unresponsive from the moment that the "auto LAN" mode enables and the sign on the right of the name of the device changes to "auto LAN". When in normal mode, devices work fine, also they work fine on LTE connection. I downgraded to 3.5.8 and everything went back to normal as it was. Why is this happening?
Nothing has changed with the upgrades. The ewelink now is on v3.6.1, including the latest little upgrade of 7.2Mb that they released, and the devices are on v3.0.1, but the problem of "Network connectivity fail"persists. I'm really running out of patience. It is really annoying, that you can't use the app normally.
I'm having the same issues that folks above are having. I also have a question for anyone that's loaded an earlier apk version in order to eliminate this problem. Did you have to set up all of your devices again once you deleted the newest version and loaded the earlier revision apk? Or do they get stored somewhere? I'd hate to have to go through the process of loading all of my devices again! Thanks