Toilet doesn’t at all times. Middle of the night, etc. so I don’t think it does it only when tub or other toilet is being used
What was the water pressure during the event? If less than 80, I would replace the fill valve.So I was able to look at the inside of the toilet while it was making it’s whistling or hiccup noise. In the attached picture there were bubbles in the water around the green piece and water was coming out of the black tube into the white pipe. It wasn’t a steady stream of water but little spurts and it sounded like the noise was happening with each spurt of water
This is awkward, but...
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