Smart Plug HS103 will not connect to router wifi
I have four HS103 plugs, and none will connect to my wifi. Note that I also have four Kasa bulbs, five HS105 plugs, and 20 HS200 switches, all of which are working fine. The HS103s previously worked. Today they all were dead; no light at all. They can be switched on and off manually using the button on the device.
I reset them by holding the power button down for 10 seconds, and they go into orange-blue blink mode. I can connect to their wifi with my phone, and the app then asks which router they should connect to. I tell them and they begin blinking blue, presumably trying to connect. They never successfully connect. Instead, they time out and go back to blinking orange-blue.
Any ideas? Thanks.