[calumma]

Just tried turning on web sharing on the mac with desktop version of OmniFocus and my Bonjour syncing problems went away. No need to turn on airplane mode and manually reconnect my wifi network. Note that I do NOT have a firewall set up on this machine (I have hardware firewall on my modem).

EDIT: don't yet know if this is a long-term solution, but it may be worth others giving it a try.