Just started happening after 232 hours... when I open the server browser it just displays "Connection Timeout" and no servers show.

I don't think it is a timeout, it shows up instantly, so I think the error message may be misleading.
Update:
Disabling windows firewall did nothing.
Re-installing did nothing.
Deleting PiBoSo directory in Documents did nothing.
Running under a different client port did not work either.
Fixed it. I uninstalled MXBikes, did a search on my C drive for anything MXBikes/PiBoSo related and deleted them, restarted the PC, then reinstalled.
Thank you for the help everyone ::)