Because you can never predict the cause for perceived ghosting, I recommend that you patiently and persistently push for responses when communications dry up. Set up a respectful cadence of communication attempts--they might have very good reasons for not previously replying.

While the repetitive nature of fractals creates a sense of order, so do the promise of skilled, fractional workers--they provide a very specific set of skills to companies and accomplish the work in less time than fulltime workers. Or so the concept suggests.