Hello Erick,
There is a setting time shutdown function of this product to product the discharged device to avoid from being over-discharged.
This problem may be caused by it.
Could you please try to set value again?
Here is the instruction for you:
For Setting Timing Shutdown
Quintuple pressing in the homepage for get into the timing shutdown interface with the mark “off” on the screen flickering. At this present, double pressing to increase or single pressing to decrease. Short pressing turns the “off” to 24:00, to23:00, to 22:00, till to 1:00, finally to “off”
After setting completed, till the “Beep” sounds and flickering stops, the new timing shutdown setting would be saved. When there is current flowing next time, it would start count-down and end when the count-down shows zero, thus there is “ Beep” sound and the output would be cut off for safe protection

Hope this can help you.
Best regards

Hello David Karl,
We are so that this is useful to you.
If you have any questions, please feel free to contact us.
Have a nice day!
Best regards