I have (3) 21005 timers and a wifi hub. Last fall I removed the batteries to turn off the timers. This spring when I was setting everything up. It took forever for my timers to connect. I left the hub plugged over the winter. I did get everything to work as it did before. Now everything might stay connect for 3 or 4 days at most. I have to unplug the wifi hub for a few seconds and upon plugging it back everything works again. I am trying to figure out why everything keeps disconnecting. Have notice that the hub is getting pretty warm.
I have tried removing all the devices and starting over. Any help is appreciated.