Hi @Julian/@Dan_Brown,
Thanks again for your report here. I have discussed this issue with the dev team and they have noted that this is expected behavior for KEF devices.
Unfortunately, due to how the transport controls are implemented on this device, using the play/pause controls will result in Roon to lose control of the device. We’ve tried to improve this behavior but there are technical limitations related to how these devices communicate which unfortunately make changing the functionality infeasible.
I wish I had better news for you here, but this is the current status at this time. Thanks again for reaching out to us!