Hello, 

I have an Arc, two One SLs, and a Sub configured as a surround system. It works great, when it works.

Occasionally (once or twice a week), one or more speakers stop working and the app shows ?+?+?, replacing the speaker with a question mark. Sometimes it's all of the speakers, sometimes it's just one or two. Occasionally, the system fixes itself. Other times, I need to reset my wireless router and/or power off/on the speakers. The issue will usually repeat again in a couple of days. 

I would appreciate any help resolving this issue for good. It is becoming quite frustrating.

Thank you, 

Eric