The same thing is happening with our remote. It seems the back button is malfunctioning (probably sticking internally). It continued trying to back up all night, so it's not a neighbor playing with us. Batteries have been in and out. It's impossible to watch anything and may require a new remote.
You can also find them locally at many retailers like Walmart and Target.
If you do not have a Roku stick that requires a wifi-direct remote, there are many inexpensive universal infrared (IR) remotes you can purchase locally as well. Just be sure it says it contains codes for Roko devices.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Streaming Stick 3600
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