No more calls or text messages. No more birthday invitations or weekend visits from your grandchild. If your adult child breaks off all contact with you, your world can fall apart. It rarely happens out of the blue. “Looking back, you can usually recognize the signs,” says Rose Griffel, a systemic couples and family therapist. “Contact becomes increasingly infrequent, cooler and confined to the bare minimum,” she says, adding that an unresolved conflict is sometimes the cause if an adult child goes “no-contact.” But often the cause is unclear. The big question the heavy-hearted parents are the…