I looked further into it myself and the problems appear to only happen if your camera is zoomed in.
Before I start running your prog now I just zoom out to maximum and it seems to work fine.
Will keep observing it the next few days.
So after testing it on multiple accounts with up to 5hours...
He sometimes get stucked in front of the Bank in Edgeville. It might be easier to use the 2nd NPC from the door.
Also it always stays 1 tile in front of the Furnance before it moves up close.
Running this for a longer time 1h+ without monitoring seems not possible for me at the moment any advice...
