You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
I have a 2023 Model X Plaid and ran into the same issue. I supercharged at a 150kW station and it was fine. 4 hours later I pulled up to a 250kW station and got the CP_a004 error after 30 seconds. I tried 3 different stations and no success.
I pinged Tesla to see if they know of this issue