Hello, I've just received my iConnectAudio4+ and I'm really happy with it so far. But sometimes the iConfig utilitty on my Macbook freezes while playing keyboard - sometimes the complete box hangs and have to be rebootet. It seems to be relatet to the connectet USB-midi Keyboard. (Oxygen 49 MKIV), directly connectet to the USB-host port. Affter disconnecting the keyboard I've set up a loop in Cubasis on my ipad air 2 and it plays flawlessly for aroound an hour now. My air is connectet to port 1, macbook to port 2. (OS-X 10.10.3) With the keyboard connectet it takes usually less than 10 minutes playing (testet with korg gadget) until the level-meters in the mixer-view of iConfig starting to freeze, or thee iCA4+ hangs up completely. Is this a known problem? Should I buy a powered USB-hub for the Oxygen?