WDR 3 plays A/OK on my following devices:
Roku SoundBridge Radio (R1000) with firmware version 3.0.44,
Roku SoundBridge M1000 with firmware version 3.0.44,
Pinnacle SoundBridge Home Music (M400PX) with firmware version 3.0.51,
Roku SoundBRridge M1001 with firmware version 3.0.44,
Roku SoundBRridge M1001 with firmware version 3.0.52.
Are you trying to play WDR 3 from a Preset or as a Favourite?
Are other WDR stations playing on your SoundBridge (which I assume is a Pinnacle Home Music)?
SoundBridge M1001 and M1000 • Clint L1 (retired) • DNT IP-dio (retired)
Google Chromecast • Amazon Fire TV • Amazon Echo and Echo Dot