I have a Witbox 2 myself and I had some sound problems myself - but this sounds strange. Well in my case it was the hotend cooler fan. Mine was a bit loose and vibrated during the print. Since I fastend the screws a bit my W2 is silent.
Also Tip: When you print via a USB-Connection and have the Auto-Leveling feature on - switch the menu to Settings and leave it there. There is a strange behavior within the Marlin Firmware where the Printer is “thinking” between every turn wich results in a “stop and go” and finally result in “blobs” of plastic on the print. When you in the Settings Menu and just leave it there on say “lights” then the printer will run smoothly.