The AudioBox is an upgrade to your computer's on board audio card. When you are plugging in the AudioBox, after the computer is up and running, you are causing the AudioBox to interrupt your currently playing audio; as your computer is actually switching over to the AudioBox as its audio device. If you are going to us the AudioBox, it is suggested that you have it connected to the computer prior to starting it up.
As for your question about videos freezing, this is fixed by changing a setting within Studio One:
There is an advanced option in StudioOne Options on PC/Preferences on MAC under the Advanced tab.
- PC: Studio One, in the drop down select "Options" then choose the Advanced menu tab.
- Mac: Studio One, In the drop down select "Preferences" then choose the Advacned menu tab.
From here select an option for "Release audio device in back ground", make sure that has a check mark in the option box and then apply that setting.
On PC, some users may also want to check the Sound panel and then the Properties button from the Control Panel/Sound and make sure that the option under "Advanced" is NOT checked to "Allow applications to take exclusive control of this device" as well.