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Can you try to use and check other apps? I cannot guarantee things are exactly as I have stated.
Also, if you want to use all those mentioned by you, install one by one and see if the problems come back.
Do you have OK google detection from any screen enabled? That might be using the microphone.
Strange, I would suggest you to boot in safe mode and try to use the recorder.
No, in safe mode I think only hangouts will work and the default recorder.
If you want to disable OK google detection, go to google app - swipe from left to right - tap on settings - voice - ok google detection and disable the option from any screen.
Can you also tell what's the problem with videos? I think you should perform a software repair using PC Companion.