I hear no buzzing; I use the Freya+ with a headphone-based system so if I had some buzzing, I would hear it on the phones.
I woke up around 3AM last night and heard some clicking sounds that seemed to originate from the Freya+. It had been turned off about 2 hours prior. That seemed odd. I just woke up and played some music on the headphones until 6AM. I will keep an ear open for this mysterious clicking sound.