I've always assumed that since he was an active target, he moved away from his family to keep them out of the line of fire. I've also assumed that he's under the radar for at least a couple of days, until he sets up the rendezvous with Roth.

I guess that, to the traitor, leaving like that would give the impression that Michael was going out to confront whoever Michael thought was behind the hit. That might lead the traitor to relax a little and not make any sudden moves. They probably monitored every phone line they could think of for calls to Miami.