iPhone no sound issue

[bazinga0101]

Earlier today I updated my 5c to the new iOS 10.0.2. Then the the speaker was working fine, for example I talked with my friend on FaceTime and I could hear her. After that I opened the podcasts and the music app and the sound suddenly stopped working. Then I tried FaceTime again but this time on earphones, it worked and then the sound from the speaker came back when i removed the earphones. But after a few minutes the speaker stopped working again. I've tried everything, cleaning dust, restarted the phone, the phone is not in silent mode and all the volume and ringer are turned up. I don't know whether it's the updated software or it has something to do with hardware. What can I do to solve this problem?

 

[dest]

Try turning off the phone then with a woodern or plastic (NOT metal!) thin cocktail stick or similar try to clean out the headphone socket, maybe it has some dust in