I have recently installed the fridge which has an integrated water dispencer, although the water comes out quite quickly at first, after a few seconds it slows right down to a trickle
As long as you are 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} the water supply to the fridge is OK then you’re best bet is to cantact Samsung who will send an engineer to check for you (I assume it’s under guarantee).