Yes this is an odd problem. Not too many people I hear having trouble with this. It's always been rock solid for me. And my ISOs are on a network share. The logs you posted looks like you are using DT Pro. Most people are using the free Lite version. You may want to try uninstalling Pro and install the Lite version just to see if that clears things up. Shouldn't matter I guess but one more thing to try.
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