Wemo smart plug not responding in Apple Home app

I have two Wemo Smartplugs I have had for a couple of years with no problems at all. Over about the last two months the devices have been dropping out of Apple Home. Both of the devices are Wemo version 4 hardware running Wemo version WW.4.00.2 firmware. I get the same response on any Apple device I use. Even when the Home app says the switches aren’t responding they both show as active devices on my Spectrum app as connect, and the switch’s are fully operative in the Wemo app. Even when I remove the devices and reinstall they will only work right for a day or so before once again showing as “not responding” in the home app.