There’s a new volume limiting setting... if this has been changed to lower max volume, the volume slider in the app still goes to 100%, but max output is trimmed back to the level selected.

Not sure what else could be causing the problem. I’ve been using the new AMP at home for 3-4 months and have connected it to several speakers that were previously powered by a Connect:Amp and the new AMP clearly outperformed the old one in all my tests.