When the links in the master sheet break, you can create a VBA macro to change the links back to the current folder.
Sub UpdateLinks()
Dim wb As Workbook
Set wb = ThisWorkbook
Dim lnk As Variant
For Each lnk In wb.LinkSources(xlExcelLinks)
wb.ChangeLink Name:=lnk, NewName:=Replace(lnk, "Roaming", "Existing")
Next lnk
End Sub