I can't pinpoint what extactly is happening, but everytime I leave my horse to afk train, it just stops moving at some point throughout the time i'm away, and to make things even stranger. The auto use items just stop working aswell. I've watched my horse go through the loop path multiple times before leaving it to afk with the auto use turned on, only to come back much later to a not moving horse, maybe 1 level gained, and the auto item feature turned off. I'm in a safe zone aswell, so I'm very confused.

There may have been a disconnect. This stops the horse from moving, and turns off auto use. Make sure your router doesnt have any forced reconnects, and maybe keep it open for a bit longer to see if any sort of reload happens

This happens to me every time I autopath. Has for a long time.  But I can have the horse running and I am sitting there watching it and it seems fine. As soon as I pull up a video to watch, site to look at, program to mess with (art), etc. The horse stops. I do not send it to tray. Its still up as normal. But the horse stops. Not reloads. Just stops. If I try to loop a horse then I end up with reloads. This is when I am standing next to the horse and not on it. It also happens when Im on a ship. Something to do with mounts. *shrugs* 
Reloads are my connection. I know it. The stops for no reason I have yet to figure out