I repeat a word and a phrase, but without oralizing them. I think them to myself repeatedly, especially in the mornings, when I get up, when I go to breakfast, and when I am nervous.
I similarly have a collection of numbers and phrases that I will repeat, generally in moments of stress or to ward off intrusive thoughts. I can perform these inwardly as well, though I prefer to oralize if the situation allows.
Wait, should you always have echolalia or can it just start and stop randomly? I currently don't remember any words, but they are usually words from random songs, that sound weird.