Hi @jonathankampia
Yes, 7.5W will certainly brown out the 5V.
An external splice is a great way to go/try.
By chance, to rule out SW concerns, do you have a normal VOXL 2 ("classic") M0154 board and USB expansion with M0130? That M0130 design will supply 2A of VBUS on the 10-pin USB connector.
Keep us posted.
Thanks!