I had this before I stopped botting on 3 of my computers. They never had the issue before but recently would just randomly stop, do nothing at all until they logged out. I did a patch fix to this and made them spam an ability when it was off cooldown to stop them from logging out so I didn't have to log them back in every morning. But it didn't really work, they still didn't move around/run around killing shit. Instead they just stood there killing the 1 pack of mobs every time it respawned while spamming that ability to stay logged in between kills.
I also had the vendor bug happen on a computer too. Just stood at the vendor spamming stealth and not doing jack shit. Those bugs eventually lead me to quitting swtor