KEF LSX UPnP Problem

Hello! I'm trying to set up my KEF LSX's over UPnP Bridge. I can successfully add new albums/playlists to my queue and start playing music, but when (1) I try to advance the track, (2) I seek forward, or (3) a song ends and naturally advances, the music goes silent. It comes back when I select a track (any track) in the queue.

Any tips for how to resolve?

I'm running LMS 8.0 on PiCorePlayer 6.1. None of my other endpoints (Sonos, Pi 4, Pi Zero) have issues. I have also tried both local files and streaming services, and the issue is persistent across platforms.

Thank you!