I have 5 DSP-W110 smart plugs. They have been working fine for a few years. All of a sudden this week 4 of them stopped turning on or off according to the schedules they are programmed on. I can manually turn on and off but the schedules are not working. I have tried unplugging them and rebooting, I have tried re-pairing with wireless router. Currently on firmware 1.22, using mydlinkhome app on iphone. Any ideas? I'm stumped.