@Cadence63
What's not clear is what you get on the screen when you turn on the Roku devices. You indicated the Roku 2 (unsure if it's model 2720 or 4210) plays. But not what happens when the Roku 3 (4200 or 4210) or Premiere+ (4630 or 3921) are on.
You also haven't described the layout. Are they in sight of each other? Because while the devices came with WiFi Direct remotes (except the 4210), and all work with WiFi Direct remotes (including the 4210), they all also work with IR remotes (included with the 4210). So, one solution is an IR remote. But, if they are in range of each other, an IR remote will control them all at the same time, which is less than ideal.
Given the age of the devices, it's possible that they could bad. However, three (or two, I think, from your description) at the same time indicates some common cause. That could be a power surge impacting the devices. It could also be someone screwing around with the remotes our of ignorance or malice.
So, let us know more about the layout, and what shows on the TV when the devices are turned on.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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