Folding at home is running out of work because of the overwhelming response. I've found that sometimes restarting the FAH client/container will trigger a new job even after being stuck in a loop for hours
If you have 5-8 hours to devote to a round, put everything you have into it. It's quick to set up and is certainly worth the cycles.
Currently, it looks like one of the main issues is not having enough server capacity. If anyone has extra resources or expertise to contribute, see https://foldingforum.org/viewtopic.php?p=314382.