The happens at least once a day (or more). Watching Netflix (and other channels), then get a network connection error and prompts me to set up new connection. I go to the network setup and scan for wifi networks and none can be found. My laptop in the same room is connected to same wifi with no issues.
I have then go to Settings -> System -> Advanced system settings -> Network connection reset -> Reset Connection.
This will reboot the roku TV and once it comes back up I am able to setup the wifi connection like normal and everything works until this same cycle happens after a few hours of using it.
My roku is updated to the latest software.