Behavior LED-5 in B-L072Z-LRWAN1 module system

Hi, I am using the B-L072Z-LRWAN1 module system,

LED-5(LD5) Behavior defined in the Data sheet.

If lit as Green indicates the ST-LINK communication is going on.
If lit as Red indicates their is no ST-LINK communication.

when PC USB port is connected to port CN7 of the module, it obey’s above points,
But if module is connected to Power-bank for the same port CN7, which having a output capacity of 5V/1A, LED-5 lit with Red indication and start flicker. what does it mean???