dtfastbear

LOL - Filterlincs ordered.

The printer (it is a laser printer) was plugged into a heavy extension cord (Covid work-from-home office setup!) I simply moved the printer and plugged it directly into the same outlet that the extension cord is plugged into, and everything seems to be working just fine. It would appear that @larryllixwas onto something about how just the combination of appliances and the length of copper could come into play. Thanks to everyone who responded. This was a much easier fix than I anticipated, and now I know a little more about the home automation I acquired along with my house. Cheers.

FOUND IT! We recently moved a networked printer from upstairs to downstairs - and it is plugged into the outlet that is closest to the electrical panel. I've tested multiple times now - unplug the printer and everything works. Plug the printer in and everything mostly stops working. Is moving this printer to another circuit the only reliable solution? Or is there the ability to filter this (thought I read something about that.) Thanks, everyone, for pointing me in the right direction. I wouldn't have suspected that just plugging in a normal appliance like that could make such a difference.

Thanks for the link. I haven't had a chance to do much more troubleshooting yet, but I was able to get my admin interface up. When I did open that, I got a series of these messages: I'm not yet sure if it is EVERY device, or just those in this part of the house. I have to do a little more experimentation. For what it's worth, I have an ISY99i and a 2412S PLM. These are both at LEAST 6 years old (how long I've owned this house). The PLM does have power, at least the little light is on. And, like I said in the original post, if I click on Fast On or Off like 50-60 times, I can still get a device to react. I can't think of any changes - things plugged in, etc. - that would have led to this, but I'll walk around and look at every single outlet and see what I find.

@gviliunasThanks for the reply! This definitely affects more than one device, but the only ones I've tested so far are in the same part of my home so they could be on the same circuit. You've given me some good leads to follow, so I'll get on that. Really appreciate the direction...

Sorry for the lack of details, here, but the previous home owner installed the entire UD/Insteon system, so I'm not super familiar with it. I've been using the "Devices" web page for years to turn on and off several lights that don't have any physical switches. All of a sudden, these lights have become very unresponsive to commands from the web interface. However, the connection is not totally lost. If I hit the button to turn on a light 50, 75 or 100 times, it will EVENTUALLY turn on or off. I've unplugged, plugged in the only UD "box" I could find. Any ideas at all where to start in troubleshooting or fixing the issue? Thanks!