I purchased my Samsung 24.73 cubic foot 4-door French door refrigerator  with ice maker (model #RF25HMEDBSG) in January 2019 and have no problems until today.  I filled a glass with water as usual and when I pulled it away, the water simply kept flowing.  It would not shut off.  Eventually had to pull fridge out to turn off the water valve which stopped it.  I can find no info on what could cause this or how to fix it.