I have this EXACT same issue and have posted everywhere about it. You are the first person who has said they have the same problem.
However, mine also randomly yells out odd things, like "I'll search for the devil for you" "it is what it is", "if this is a dream I don't want to wake up", "good night", "sometimes it's nice to get something new", "sometimes you need to be quiet even when there is more to say" and other bizarre outbursts. No one and nothing said Hi Galaxy. She just erupts.
I notice too, that on the hour, if giving the time she says "it is six hundred", instead of six o'clock. Odd little machine.