It looks like the new firmware 2.61 fixed the issue. Now my LUMIN U2 Mini works perfectly, just like it did before firmware 2.58 and 2.60. Playback started without any issues after being idle.
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How can I initiate the ARC 1.74 update? 2.61 was successful for the Nucleus.
Through the Apple App Store / Google Play Store. It will probably install automatically at some point, but look if there’s an Update button to get it right now through the store
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Okay, I will watch for 1.74 for ARC. I love ARC, use it in my 4Runner all the time.
All other devices on 2.61 now. 
Thank you!
Seems like it’s still stuck:
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Just wanted to add that my Roon playback issues with the SHD seem to be fixed. Thank you!
Same here. Playback issue since v.2.58 with my Auralic Altair G2.2 seem to be fixed. 
Same here…Thanks
Looks like things are back to normal with my HiFi Rose RS130 after the 2.60 and 2.61 updates. Thanks, Roon team!