In another thread I asked how Tablo apps learn the ip address of the Tablo. Even if the router is changing the ip address, the apps should learn the new address. Address reservation is only needed when the ip address is manually entered into the client.
One way I have found to check the ip address of the Tablo is to open a Windows 11 command prompt and enter ping t4g2.local (or maybe t4g4.local for the 4-tuner). Compare that to the ip address shown on the settings page of the app and on My Status - Tablo TV.