Gurgling sounds on my oppo ph

[Android Central Question]

I have an oppo x2 neo pH. Model cph2009. It has started to make occasionally gugle sounds. Also cuts my calls or people can't call me. Texting is fine. I restarted it. Works for a while then cuts off my call. People also haven't been able to get through omg help!

 

[B. Diddy]

Welcome to Android Central! Is the gurgling sound the exact same each time (which would suggest it's some kind of notification tone), or is it a little different (which would suggest a glitch)? How often does this happen?

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