Hi, how can i fix slow charging and buzzing noise on my acer swift Go 14?

Hi, there seems to be a problem that came up recently with my laptop. Firstly, when i plug in the charger, the laptop makes a buzzing noise and the screen starts lagging, as does the mouse and any on screen functions. Then the problem of slow charging arose the day after. My laptop had a battery of about 5% and i didn't notice so it switched off to save battery.I then plugged it in, the charging light came on and stayed on, I left it charging for about 45 minutes and when I turned it on the battery was 6%, which has never happened before. Can anyone help with this issue, and the buzzing noise and laggy screen when my charger is plugged in?