This is a strange one, please bear with me.
ISY 994i controlling about a dozen lights using old Insteon dimmers.
I recently changed my router to a ubiquity UniFi gateway (UXG-MAX) and have been having strange issues with the ISY ever since. If I log into the device locally using my PC, I can see and control all dimmers with no problems.
However, if I try to control the lights with Alexa commands, Alexa will say sorry the hub for that device is not responding. On my phone, from the UD mobile app, i get message: :ISY is now online, then ISY is now offline, these messages will pop up on average, staying online for about five minutes, then going off-line for 30 to 60 minutes.
When the device is shown as online, it will respond to an Alexa voice command, in other words, Alexa will change the dimmer setting as requested, but then Alexa follows up by saying “sorry, the device is not responding” even though it has responded.
I have tried both static IP and DHCP, problem exists either way. Over the years, I have used the ISY with quite a few different routers And have never had an issue like this one.