I've seen this problem twice and thought to put it here to check if anyone has dealt with it before.
I've a M321i-A2 in the bedroom runing 1.06.x firmware and was setup with wireless connection with a router I've. The wireless connection worked until I had to reboot the router for some other purpose. Once the router is back up, the TV wireless won't work. I see the <..> icon in front of the "Network" option. It does show the SSID but won't let me select to be able to re-initiate the connection. The only option worked for me was to reset the TV to factory defaults and set it up again..
Has anyone seen this problem?