Follow the data sheet's recommendation... Always unless you KNOW SPECIFICALLY OTHERWISE...From the symptoms you quote you have a 'floating' input to the S.R.
Go over your wiring carefully and If you don't find it... POST YOUR CODE AND AN ACCURATE DRAWING OF THE DEVICE. An Accurate Schematic would be great but good pictures of your wiring are better than nothing. Without your code and drawings/pictures anything returned is at best a guess...
Bob