iOS 9.3.2 update on my iPhone 6S made my Bluetooth audio on Plantronics Legend and Jaybird Freedom Bluetooth Earbuds both malfunction only on phone calls. Music and books audio still worked fine. Phone calls would cut in and out or pulse the sound about 4 times per second where people could hear me but I could not make out what they were saying.
Googled an article - 10 Common iOS 9 Problems & How to Fix Them where I found the solution under the Bluetooth section...
HOORAY for the reset your network – Settings>General>Reset>Reset Network Settings – which resolved the problem, though it was a PAIN to forget and re-pair my devices and having to reset up my WiFi. The key point: they work again! Hope some of this helps others with a similar problem...
iPhone 6s, iOS 9.3.2, Calls audio cut in and out or pulse
