What is the current software version? (Roku will probably want that to help you. I'm just stabbing in the dark.).
I would also do the "check now" for a new update at that screen. I'd also try home>system>power>system restart. (That's the "reboot your computer" type of "who knows, maybe it will fix it" suggestion).
In home>system>advanced system, there is a "network connection reset." I might try that since the time comes from the internet. (But, if you can check for new software update, then your network must be ok.).
"[Roku CEO] Wood’s goal is to control video access to the world — to be the 'one box that rules them all.'" (Techcrunch, February 23, 2011). The latest software update removed any doubt who rules & controls my TV.
