Thanks for the post.
Can you please provide us the following information:
-Roku device model, serial number, device ID, and software OS/version (these can all be found in Settings > System > About)
-tracker ID when this issue occurs (when you see this issue occur, press the Home button 5 times, followed by the Back button 5 times)
-steps to reproduce the issue you are seeing
-have you tried using another browser when using Airplay to see if that helps
With more detailed information, we will be able to assist you further.
Roku Community Moderator