I have two surveys which hang regularly when I republish them. They seem to be OK when I update them on my phone, but I have to be concerned that there may be some unseen problem that will affect data collection. I don't want to give the survey out to my volunteers if there will be a problem with the data. I have not renamed the survey files or made any major changes. One survey is just a new version of an older survey with a couple new modules added, but I'm not trying to add those modules to the old survey. I'm creating an all new survey with those new modules.
Both surveys seem to consistently hang on republishing.