My Bluetooth would work sometime and then drop out. Tried all the suggestions online and even upgraded my system with no luck. I had no choice but to replace hardware.
The Macbook come apart easily except for one corner which I had a lot of trouble with. The instruction on ifit were detailed and easy to understand. Put it back together and my Bluetooth has worked perfectly and not missed a beat. Thanks ifitit
Use an egg carton to organize the many screws and steps.