On Tuesday May 19th, we deployed an update to the SoundTouch applications. This release primarily updated compatibility and usage of AirPlay 2 for the SoundTouch Wireless Link adapter along with some minor bug fixes.
Android App: 25.0.4
iOS App: 25.0.4
May 28, 2020
May 30, 2020
I'm sorry to hear you're unable to group your speakers after the most recent update.
If you haven't already, please try to factory reset your speakers then set them up as new devices to see if this helps to make a difference. As you didn't list your models and the reset process is different between some products, I would recommend visiting this link to search for factory reset instructions.
I would also recommend unplugging your router for a minimum of 5 minutes to see if this helps make a difference.
Mar 6, 2017
Same issue with stereo speakers on my SoundTouch 10.
Separating and then reconnecting the speakers as a stereo pair did however resolve the issue.
Nov 9, 2017
After the update I regularly get the message ‘Service not available’. I have tried many things, but unplugging my ST 10 and 20’s so far has been the only solution.