Issues viewing streams may arise based on your connection or device status etc.
Your issue may be resolved by trying the following actions.
・Restarting the app
・Restarting your device
・Clearing the app's cache
・Closing all apps other than REALITY
・Deleting any unnecessary apps, videos, images etc. that may be using device memory
・Updating the REALITY app (if an update is available)
Finally, please try running the app from a location with a stable connection.