Ground hum when using XLR to monitors

Ive noticed latley that i get a low frequency hum that wasn’t there before when i connect my QC directly to my Yamaha Hs5 monitors.

It gets a little louder when i unplug on of the xlr cables and go into only one monitor

The groubd lifts doesnt change the hum and when i use the 3 and 4 outs with trs cables directly to the monitors the hum dissapear

The hum also dissapears when i plug the usb into my pc. All my units use the same powerstrip so i dont think its a ground loop issu

Ive conntacted the Support already and will see what they say but im posting here to see if anyone has some kind of solution to the problem

First, what power supply are you using for the QC?

right i forgot to mention that im on the original PSU the QC came with