Stopping talking to any of your relatives should not be more than three days as the Hadeeth states: Muslim is not allowed to boycott his Muslim brother more than three days. They meet, and each of them tries to turn his face from the other, and best of them who starts Salam on the other.

Being in contact with our relatives does need daily talk, but usual ways of contacts e.g. messaging, phoning, emailing, sending Salam or gift etc which is understood by common person as a contact. If the relative is far and you con not contact him every three days, that is not Haraam as far your contact with him is understood by both of you as a normal situation of good ties between you.

Short cutting of the contact is not acceptable as long cutting.

 Wassalam.