I am using Android 5.1 on Nexus 4 and noticed battery drain faster than usual a few months ago. Thinking I need to update Android to newer version I decided to check CPU usage first and found that process "system_server" - BluetoothPhoneService causes high CPU usage:
Researched on other forums and other have same issue but I have not found solution. Anyone is familiar with this issue and thinks updating to Android 5.1.1 would fix it?