UPS making weird noise

Hello, i didn’t know where to post this but a lot of people here use UPS’s so i thought to ask. i have had this Eaton 5E Gen2 1600VA 900W FR USB 5E1600UF inverter Line-interactive UPS for the past 6 months now, and recently i realized it’s making these noises occasionally, sometimes the noise isn’t that loud but this time i can hear it without having to crouch. To be clear the UPS has been operating fine even now, no errors, no beeps, had a few power surges and outages and it always performed well but this buzzing sound does not sound very normal to me. i looked around on google and people say it might be because of the 50/60hz frequency but usually it’s not this loud. I even went to the retailer i bought it from and when they plugged it they didn’t hear the noise and ofc they didn’t because it wasn’t happening all the time so they didn’t seem to think it was fit for replacement or for a refund unless i leave it to them for inspection. i have 2y warranty on it so i should be fine but still wanted to ask people here that deal with UPSs. here is a video showing the UPS with sound of the noise it does : https://imgur.com/a/eOPuSgl