Standing between prayers

It has been reported in the hadeeth of Mu’aawiyah ( Radia Allahu anhu) that he said:

"The Prophet (Salla Allahu alayhi wa sallam) ordered us not to join one prayer with another without leaving or speaking (in between)" [Transmitted by Muslim and Abu Dawood]

So the scholars have understood from this , that a gap most be made between the obligatory and the Sunnah- either by speaking or by changing one's place.

SOURCE: Fataawa Islaamiyyah 1/346 of Shaikh Uthaymeen (Rahimahu Allah)