I have an SMA XBee configured as the coordinator and an XBee configured as an end device. If I connect the coordinator to a USB charger or a Raspberry PI USB port (just for power), the end device will not set OP (Operating PAN ID). Meaning, it will not be able to connect to the XBee network. HOWEVER, if I connect the coordinator to my PC (don't even need to attach it to XCTU), then all works and I do get an OP on my end device. Can anyone help me to understand why?