OD-11 not working in Optical mode reliabky

Hi gang, I had a single OD-11 for years and optical audio in (TOSLINK) used to work fine from my TV. i recently bought a second speaker and while it immediately appears as a group in the Orthoplay app, now the Optical channel almost never works (no sound being received from TV). Any ideas what I’m doing wrong?

For context, here’s my setup:

  • 1x Optical cable from TV to powered optical splitter.
  • 1x Optical cable from splitter to each speaker

I’ve also found some WIFI connectivity issues in general since I got the second speaker, like Airplay not working reliably also.

Really frustrating — it was amazing with just one speaker, and now all these issues with the second one added!

Thanks in advance!