TMO-G4R Secondary Network Drop

While using the TMO-G4AR gateway for home Internet, I created an additional network isolated to 2.4 gHz only for a specific signal repeater. This configuration worked fine for several days, however, now I am experiencing an issue where, although the primary network has Internet service, the secondary network does not. The secondary network is displayed in the T-Life app but it has no Internet service. Suggestions?