I did a little more research and found some people are reporting connectivity problems with the PLX Kiwi system.
Give this a look. It appears they updated the firmware at some point. I'm not sure that solved any problems, though.
http://plxdevices.com/forum/viewforum.php?f=1
I've also read that DashCommand users were having problems after updating to IOS5. I believe there's been a recent update there as well.
http://www.palmerperformance.com/for...php?board=13.0
The forums are a pain in the ass because it appears people don't know how to differentiate between issues they're having with their vehicle vs. issues with PLX vs. issues with DashCommand...so it all gets intermingled.
This is discouraging, but it looks like PLX stands behind their product pretty well. If that's your problem and you've purchased in the last year it appears they'll replace your unit free of charge.