6. About the problem in Exclusive USB Audio Access Mode

Some permission confliction and compatibility issue may occur to certain Android mobile phones or players due to system and hardware differences in Exclusive USB Audio Access Mode.

Here is the known situation: 
1.Some mobile phone without volume buttons: You could adjust the volume by sliding up from the right edge in now playing page of FiiO Music APP . 
2. Some mobile phones' power management policies do not allow third-party apps to run in the background by default. This can cause the APPs to pause in Exclusive USB Audio Access Mode after the phone sleeping for a few seconds. You can manually set the app stay working while asleep in the battery management setting of the mobile phone.
 3. Operating other apps in Exclusive USB Audio Access Mode may lead to stuttering or no sound problems. We will keep optimizing this problem. And it is recommended to focus on listening music if you are using Exclusive USB Audio Access Mode. Or you could exit the Exclusive USB Audio Access Mode in order to avoid this issue.