One of my old switches (pic attached) has recently starting randomly switching off and a few seconds later turns back on. It can be anywhere from a a few minutes to 20 to 30 minutes and it happens again. I have about 25 of these and this is the only one with this issue. I'm a LONG time Insteon user and am stumped what the problem could be.

Any ideas what could be causing this?

That's an oldy, single band. I had several them at my last house, one at the far reaches of my electrical system. They get flaky after time or power events like brown/black outs

• Try a restore device

• If that doesn't work, factory reset and and restore device

It could just be going bad, such as a bad capacitor.

17 hours ago, johnmsch said:

One of my old switches (pic attached) has recently starting randomly switching off and a few seconds later turns back on. It can be anywhere from a a few minutes to 20 to 30 minutes and it happens again. I have about 25 of these and this is the only one with this issue. I'm a LONG time Insteon user and am stumped what the problem could be.

Any ideas what could be causing this?

Now that's an oldie. Not necessarily a goodie. I didn't realize that Smartlabs was making the Togglelinc back in '06. Insteon devices from that time frame had power supplies based on a Microchip App Note 954 located here: https://ww1.microchip.com/downloads/en/appnotes/00954a.pdf

They had a habit of burning up the filter cap/zener due to powerline voltages/spikes. Another issue was with the micro switch contacts themselves.

Since the device is a relay switch, I'd guess that the 470uF cap (c2??) is breaking down (power supply drop out). You could open and inspect, but to be honest, these devices are probably at the end of their useful life. The relay units are not bad to open up (no Triac soldered to the heat sink). I still have a number in service, but when they die, will retire them.

The good news is that you apparently have very well regulated power as well as rather "clean" powerlines. Later devices incorporated dual band as well as additional simulcasting improvements.