If you pick any hero on Sandbox mode and then change to Ivy, her intro line that says: "Looks like i'm missing that job interview" starts to loop infinitely. Only happens with that voice line, at least with Ivy.
Same bug happens to me as well, and only with this voice line. If you leave the Heroes menu, the sound still continues looping until you select another hero.
This also occurs on the hero selection screen for the matchmaking.
You can repeatedly select and deselect her until the voiceline pops up, at which point it will start looping