For the "rmote jumping around" problem, try restarting your Roku. (Note that if yours is a Roku TV with "Fast start" enabled, turning it off and back on just puts it into and out of a standby state and does NOT give you a complete restart.)
Depending on your Roku model and Roku version number you'll find the "System restart" option under "Settings > System > Power" or if not there, under "Settings > System".
If a restart doesn't do it, or if you don't have sufficient control with the remote to navigate the Roku menus, you can also restart by pulling the power plug to the Roku for a few seconds then plugging it back in and waiting for it to restart.
Same thing just started happening to us on Disney+ as well. The system reset seemed to have worked for now.
I could'nt access "settings..etc" so I just unpowered it and pugged back in. Voila! Thanks.
