Please check the following:
1. Check the battery level
Make sure the power box has enough charge. If the battery is low, the device may stop automatically. Please charge it fully and try again.
2. Check whether the timer is set
Your Swim Jet X may have a runtime timer enabled. If you have set a duration—for example, 1 hour—the device will stop automatically when that time is reached. Please check the timer setting in the App or on the device and adjust it if needed.
If the device still shuts down after you have checked both of the above, please provide:
A photo of your Power Box showing the settings, or a screenshot of the settings in the iGarden App.