Jimzix,
I have several computers, some with static addresses and some DHCP assigned. When this happened, NONE of the computers would access the Tablo. Amazon Firesticks (I have 4) and the Android app on my phone still worked fine. It was odd because looking at the connected devices list on the router, the static IP for my Tablo would appear for a few seconds and then disappear even though pinging the IP address returned the expected result. Restoring the backup config file to the router brought everything back to normal.
I have fiber into the modem on the outside of the house provided by Consolidated Communications. From there, I go to my own D-Link router and the Tablo is hard wired to the network. I have a dynamically assigned IP address from my ISP and I KNOW it changes anytime the router is rebooted. Because of that, I run a DDNS so I can always reach my IP cameras, home automaton system (ISY994i), whole house generator, weather station etc.
Hope that answers the question.
Steve