UR242 sound break in Mac OSX 10.11.1

I have updated the driver to version 1.9.6 and TOOLS for UR 1.0.2.

In Mac OSX 10.11.1, I choose Steinberg UR242 as default device, when I play music (iTunes or VOX), the sound will break about 5-10s irregular (no sound but player is continue).

In Logic Pro X、Cubase Pro or Ableton Live, when I playback, the sound will be break also, and I have to reset the UR242 to make the sound back.

Can you help me ? Thanks !

Same problem with UR22: