u/DoughnutCareful1816

I usually game at night on my Lenovo Legion 5, which has a 230 watt charger. The other day I noticed that there was a very faint electrical buzzing sound coming from my charger, but it was gone the next morning. I tested it again today and same; at night the buzzing sound is present but during mornings and evenings it simply goes away.

Same laptop, plugged into the same socket, with the same wiring and same load. The charger is original and works fine, so I'm thinking maybe it's the grid with higher/lower load during different times of day? Has anyone else experienced something similar?