Are you sure the moveto was firing? I've noticed there are some cases where the api returns in los but you aren't in los. I was able to confirm in console that target.los was true while casts were showing not los. I changed the console to print out mob location, my location and los so I could get the data before reporting it to mastahg but I couldn't reproduce the bug. Or does that mob move around? It could have been spamming requests with changing locations and that would cause nav move to freeze up.