Export can't find images and hangs

An export that runs into any issues (can’t find an image) just hangs. No error (until you kill it) and no effort to actually finish the rest of the export. Lightroom CC is essentially useless to me now. I pay you for 3TB of storage and now I can’t get my images out when I want except by doing tiny batches of exports and playing whack-a-mole. Awful.