That's bizarre that it only happened to one of your boxes.

I've installed OnHubs for two of my clients, and I just found out that one of them reverted to factory defaults, so I'll be heading out there to fix it. Fortunately their main desktop was hard wired, but their printer has been knocked off because I put it on a static IP and the subnet changed. It's weird, but for some reason the TP-Link OnHubs default to a subnet in the 80 range. This one was on 84, mine was originally 86. I wonder why they did that...