sharkdrive, I had the exact same thing happen to me. I spent several hours trying to figure out what was wrong. Two days later it was working again, but I don't know why.
During this process, I tested with running squeezelite on a Linux machine and had similary problems with it -- until I specified the IP of the LMS host, then it worked perfectly. So, there is something intermittent with the LMS host and its ability to allow broadcast queries from squeezelite?
Unfortunately, since the WiiM does not allow the specification of the LMS host, you are stuck until it decided to start working again.
I never had this problem with my "real" Logitech Duet, so there must something a bit different with squeezelite. I don't miss my Duet except for this issue.