Gondor was pissed off about the constant check-ups and decided to just stop looking out for the beacons.

(There was a ship nearby that could have rendered assistance to the Titanic, but due to the way the radios worked at the time they could only talk to one ship at a time, and this vessel’s radio person got frustrated with interruptions that they simply turned their radio off and did not hear the Titanic’s distress signal)