Not too sure about this suggestion since I want to have the entire drive with all of its folders and sub-folders available to my network and accessible. Any other possible alternatives?? Thanks . . .

Have you tried changing the channels for both bands?? Perhaps there is some type of interference.

Model : Archer C5400 Hardware Version : 2.0 Firmware Version : 1.2.2 Build 20170912 rel.56240(5553) ISP : Comcast I'm having a problem using the external hard drive that I have attached to my AC5400...