Recently ran into a tank I can only assume was a bot, as I encountered him 3 times all in Sirensong.

First run, he tanks the first 3 trash packs fine. Then the fourth pack right before the first boss passage he simply runs past, grabs the chest and stops dead in front of the blocked passage.
In this encounter, the healer and us DPS manage to clear the trash without him, and as soon as the passage opens, he sprints into the boss and engages while we're trying to figure out what happened. We didn't enter, he dies, returns and runs straight back in.

We kicked him as a troll. However, later, when levelling a different dps job, ran into him again. The exact same process occurs. First few packs are fine, runs past fourth grabs chest and afks. Difference is this time the healer wasn't able to keep us up to kill the trash. This time the tank simply never moves or responds, just remains stationary in front of the blocked boss passage.
Reported him as a bot and kicked him.

Third time, I warned the party that this was likely a bot due to my past experience with him, but this time he stops to tank each pack individually, so either he fixed his bot program, or was actively trolling my party the last 2 times I encountered him and my warning to the party served to deter him.

Still believe he was a bot, owing to the fact that his only jobs were a 70 Tank, Healer and DPS and in full HQ crafted 380 gear. No reason I could fathom for him spamming a level 61 so much that I encountered him 3 times on separate days.