Greetings @RC_haruko26
Welcome to the Roku Community and thanks for posting regarding the issue you are experiencing after updating your Roku device to the latest OS 12.0.
Please be aware that I have passed along your concerns and details to the appropriate Roku team to investigate further. Once more information is available, I'll be sure to update this Community thread.
In the meantime, can you please provide a video of the issue you are experiencing so we can better understand what you are seeing?
Once we have that information, we will be able to pass it along to be looked into further. We look forward to hearing back from you.
Thanks,
Danny
Danny R.
Roku Community Moderator