How to keep Canon 5dMk2 "connected" while shooting tethered

Folks,
Is there a trick?
When I shoot tetherered LR3 loses contact with my camera (5Dmk2, but also 30D) way too quickly before shooting an image. Just fiddling with the props, set, lights, etc., is enough to lose contact. I have been turning the camera off and then back on but that's ridiculous.  I want just leave that rig set to make me a full screen image upon testing (firing shutter) and holding that image as long as I need foe extended checking. When I set it for live view on the tethered laptop I want it to stay open, as I probably have the laptop plugged in.
What am I missing here in the way of a setting?
jonathan7007

First, a caveat...  I don't use tethered shooting much.  Infact, it's been at least a year, but my last experience...
You generally lose connection when the camera auto-shuts off.  So if you set the camera to not do that (external power? Menu setting?) then you shouldn't lose connection.  But I don't remember if it's possible for that camera to be set to not auto shut off.. if not, set it for as long as you can.  At least, that's what I remember!  Sorry if I'm not more helpful!
Cheers!

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