iOS 8 sound and keyboard showing lag

Hi everyone, I have a simple scene where I have an input and sound that starts to play on awake. When running my scene on the actual iphone ios 8, when I tap on the input keyboard shows up and when it's showing up the sound is breaking up multiple times in 1-2 seconds, and then continues to play normal. If I hide the keyboard and then open it again sound plays normally without any lag. So it looks like it's only happening when it shows the keyboard first time. Maybe anyone knows a way to fix this?

I'm in unity 5.3, also I tried changing params for buffer to "good latency", "best latency", "best performance", nothing helped.