We are in the uk
We have had a new Roku express for a couple of weeks working fine, but in the last two days not connecting/finding home WiFi. Our other older Roku express working fine. Have tried on two TVs, so unplugged power and other cable, have turned WiFi on and off again but no joy. Also invested in a WiFi booster but makes no difference. The light on the front flashes white continuously - have we got a duff stick?
I've run into this here several times. This has always worked for me:
If that doesn't fix it, try disconnecting the power to your Roku for a few seconds. When it comes back up, see if you then can set up the network connection.
Also, make sure you're using a 2.4GHz channel from 1 to 11. I don't know if any Rokus support a higher channel and since one Express seems to be connected I would think you're already using a supported channel, but just check to be sure.