Hey, this is a known issue right now. Several users are hitting it, especially with Auto mode.
Try manually selecting a specific model instead of Auto. For example, composer-1.5 or gpt-5 mini. This usually works around the problem.
Auto mode sometimes fails to fall back to an available model during high demand periods, so picking one directly is the most reliable workaround for now.
The team is aware. You can follow this thread for updates from other users experiencing the same thing: Repeated High Load Error
Let me know if switching the model helps.