I’m wondering if my problem really is an overheat condition.
I’ve been using the Drobo hooked up to my Mac via firewire for a good week plus doing video transcoding. No problems. I take the thing and hook it back up to my time capsule to act as a NAS and in less than a day I get the everything stops / orange light (overtemp) problem.
Now, where my Time Capsule is located is out in the open. It’s not locked away in a box anywhere where heat would build up.
I think the next step would be to bring the Time Capsule over to where the drobo was sitting for a week and see if it overheats in that situation (thus eliminating the location and pointing the finger more at the Time Capsule / USB connection configuration).