Radio playback over SB1 is slowed with lower pitch

I am running LMS on a Synology DS-718+ with a mix of SB1, SB3, and Boom Radio in the house. I like to play a local public radio station, and on the SB3 and Boom it works fine. On the SB1 the stream will play, but everything is a bit slow and the frequency is pitched down a bit. After half an hour or so the stream dies, and restarts, but still at a low pitch and slow playback rate. I suspect that there is a sample-rate mismatch (SB1 only knows, say, about a 48kHz sampling rate but is receiving a 44.1kHz stream...or vice-versa..I dunno), but it only happens with one of my players -- the SB1, which also happens to be wire-connected to my home network. I'm using the native radio feature on LMS, nothing fancy.

Any thoughts on what might cause this and how I can fix it?