Both of my ATV1's stopped streaming today!

Both of my ATV1's stopped streaming today! I can set them up for streaming to any of several Macs in the house, but I can't stream any content!

The user interface is very sluggish on both of them. Every time I try to scroll down to "Shared Movies" it jumps back to the top of the menu before it recognizes that I have hit the select button. I believe this is the reason I cannot stream content--one time I was able to stream music but that was after much trial and error, and I have not been able to repeat it since that one time.

I have one ATV3 which still seems to work fine.

I am using hardwired Ethernet, not Wifi.

Anyone else seeing this?