While watching anything, whether it's pre-recorded or live, the picture starts to jump, shake, skip, etc... While the sound is still going as normal. Both Roku devices (Roku Simple and Roku Voice), are caught up on updates. We've rebooted/ reset several times before and the only resolve is to rewind a bit of what you're watching. What is the problem here?! Very frustrating!
Try unplugging your modem and router for 30 to 60 seconds.
"Simple" and "Voice" refer to the type of remote being used, not the model of the Roku itself.
Are these two remotes in use for the same Roku, or two separate Roku units? What model Roku(s) are in question? Settings > System > About will give you the Roku model and model number.
Does this happen for everything you view or just on a specific channel app?