[2021] I keep hearing random robot voice speaking while in combat. Am I losing my mind?

It's a male text-to-speech voice saying "Slice them apart." randomly when I am in combat. I thought something was wrong about my PC but it's only happening in GW2. I thought maybe it can be one of the combat lines of a class but it sounds so robotic and different from any race. Did I get hacked? Am I losing my sanity? Send help.

Update: I've made some research on internet and someone in Reddit had very similar issue only with different voicelines. His last edit says he fixed the issue and it was probably caused by a Discord bug because the voice was same to Discord's male text-to-speech voice. So, I've checked Youtube and yes, it was the same voice as mine as well. Also I've been playing all night but I've started hearing the voice very recently and after this finding, I've relazied I've started hearing it about the same time I've opened Discord to message my friend. I've shut down Discord and haven't been hearing the voice for a while now. I will update if anything changes.

Update 2: Thanks to u/LonsuLii

https://www.youtube.com/watch?v=6V5g2NuISF0

It wasn't shutting down Discord what stopped it. It was me switching to DPS build and stop casting Dual attacks on allies. I thought either my PC got virus or I lost my sanity after spending hours to make Virtuoso work in PvP. Looks like it wasn't any of them.