Microphone not working correctly XPERIA Z5?

Hello everyone, two days ago, when trying to send a WhatsApp audio, I discovered that the person I sent the audio to could not hear it, and neither could I. I tried several times and I ended up calling that person. The other person could hear me just fine, so I thought it was WhatsApp error, still, I went into Settings > About Phone > Diagnostics > Test > Microphone. The microphone did not work, and it recorded kind a sound that was very similar to the one that TVs make when they can't connect to a channel, when you see the black and white flashing screen and you hear that annoying sound. I restarted it, tried sending a few audios to my sister and it worked fine. I tested it again and it worked. Today I sent another audio and again, the mic did not record anything, and when I played it, it sounded the same. Restarted it again, did the test five times, the first two it worked, and the other three it didn't. I'm pretty sure it's a software problem but I want to know if I can fix this anyway before the 7.0 release, in which I hope this will be fixed, along with the other problems I'm having with my Z5, like some headphones won't work and I have to use the app SoundAbout to force the sound to play through the heaphones and the flashlight problem, where it hides the icon that is used to toggle it in Quick Settings. I changed my iPhone 6 for the XPERIA Z5 since I was an Android user before and the iPhone just wasn't for me. I got the Z5 because I thought it was the best combination between pure stock android and good pre-installed Sony apps. I'm really having a hard time with this phone and I'm planning on going back to iPhone. I don't want to, but I will if I can't get these problems fixed.
Please help :D:D

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