Repeating the search can help find new sources, or refresh old ones. This ususally works better than the "resume" button.

Usually "awaiting sources" means all the previous sources have gone offline, and some won't be back until the next weekend.

You can make it easier for sources to connect with you if your setup allows "incoming connections," but this can be much more work to set up. Search the posts about "Direct Connect" to find out more.