I decided to make this a separate issue. After connecting to another Sena headset using BT, I started to get "INTERCOM NOT FOUND" message, preceded by two tones or "beeps". VERY annoying. So, I went into the app and deleted all BT users under Intercom settings. The tones and message went away.
Then, a few days ago, I used Open Mesh to connect to another 50S. Everything worked fine until we parted ways. I now get the same two tones, or beeps, every few seconds, but without the INTERCOM NOT FOUND message. I have looked in the app and NO BT or Mesh intercom users show up, and Open Mesh is OFF, but I still get the two tones, making the headset unusable for listening to music or GPS instructions.