Further info

The loss of connectivity to ControlMac happens whenever the lid is closed on the MacBook.
If the lid is not closed I can quit ControlMac and relaunch ControlMac without any problem.

Rick of Audio Images suggested I disconnect BT Vision in case that was causing the problem.

However disconnected BT Vision and rebooted the BTHH2 so the only things connected were the

MacBook,MC200 and a WD MyWorld NAS but the problem remained.

So I suspect it is something to do with the 'sleep' state of the MacBook and the BT HH2.

Any ideas

Tony
861v6+OE34+LPS+ID41, HD621, MC200, DSP7200.2, DSP5200HC, M6, DSW, Sky HD, BDP103.