Hi Garry
I think they mostly all do this.
As it it’s primary use is to charge phones and other devices NOT a power supply they use this low current to detect end of charge and subsequently shut down. This is pretty normal and if you are trying to use this as a power supply it is not designed for that task.
A fix would be to connect a resistor across the power connections to increase the current requirement but this is pretty wasteful.
The answer would be to use this for what it is designed for.
Cheers Bob
