Base Station does not complete its speech

Normally when you press buttons on the keypad, the base station makes an announcement. ("Simplisafe On - Home" for example).

Recently my base station has stopped completing the announcement, instead just cutting short ("Simpli......")

If you hit the command button again it will complete the statement, but I am not sure that is necessary since the keypad also shows the status. There are no warning messages, is this a sign that the batteries need to be replaced or something else?