Happened to me just a couple of days ago. I restarted and everything was fine.
Honestly, I see the whole platform as a giant work in progress. And I mean all modern devices are, but I encounter minor and somewhat major issues with the dx220 pretty regularly. I like the team, and I especially like the sound, so I do my best to ignore the bugs and assume someone is working on them.
I’ve got a technical and engineering background, so I also have some compassion for the complexities and issues iBasso is trying to solve across hardware, OS, and individual software elements. But yeah, lots of problems and missed opportunities, unfortunately.