Strange mic issues

Hello! I got this occilating high-pitched noise when I activate the internal mic. I have noticed this sometime in the past but it hasn’t allways been there. Today it is very loud. It’s like a slow sine wave, suggesting some electronic interference. I tested recording and it gets captured, so it’s not just the output. Then I tested unpluging my headhones and got the next wierd issue:
No mic monitoring on the internal speaker. Pluging the headphones let’s me monitor the mic, but not in the speaker…
Also, the whinning noise is captured when i have the headpones plugged in… Without them the recoding is clean…
Annyone got a clue? Dirt in the headphone jack? Software issue? I will try a jack cleanup and see…

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In the vocoder, the mic monitor works though the speaker… Not in the tape view as before.

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Could you give a video example? might be interference from the USB cable that will give some hiss.