I'm having issues with connectivity for my usb devices to my panasonic UB820 4k player. I was told by panasonic that they support up to 4tb external HD after accidently buying a 5tb hd and trying to connect it. Well I bought a 2tb WD Black external HD and the 4k player still wont recognize it! I get a connectivity error that there is nothing plugged in. I have had this same issue with another usb 3.0 flash drive. But my 2.0 16gb flash drive does show connectivity. Another 3.0 flash drive did connect but didn't show all the video files. Has anyone else had this issue and do you have a solution? I have movie files I want to be able to watch through external HDD with this player and I hope I'll be able to. Thanks.