I have the converter and it disconnects if I try to use more than one Bluetooth device with whatever is connected to the bike. For example, if connect the converter plus wireless earbuds to my iPad it will do what you are describing. As long as I connect nothing else it works perfectly. I thought it was faulty and / or the battery and called Keiser to troubleshoot. Hope this helps. I have never changed the battery and I have had it for over 2 months using almost every day. Make sure you also update the firmware on the converter using the converter update app.