If you run into freezes or the game crashing, try to clear the cache for your console. This will not delete any saved data.
- Select System Settings in the Home menu.
- Select System.
- Select Formatting Options.
- Select Reset Cache.
- Select the User you want to clear cache and follow the instructions.
- Restart your Switch.
- Start Rocket League.
If you are trying to solve a Load Failure error in Rocket League and this did not help, try the next step: How do I back up Save Data on Nintendo Switch to troubleshoot Rocket League Load Failure errors