All of a sudden my video is coming in and out while the audio plays just fine. I have tried all 3 Roku in our house with sane results. Other inputs are working fine and changing to a different input makes no difference.
Need far more information. What model Roku players? Are they connected directly to the TV, or though a receiver/sound bar? What make/model TV? Are they older Roku players connected with analog cables (red/white/yellow) or with an HDMI cable?
Unless your Roku players are super old, and all suddenly broke at the same time, the fact that all three do the same thing makes it more likely to be a TV issue, not something with the Rokus.
Does this happen on a particular channel, or on all channels?