Thank you! I hadn't changed anything that I was aware of, but I had enough gear to start running a known supported build and everything is running great now.
This morning my build was running fine but when I came home D3 and DB had both closed themselves. When I restarted the bot I was surprised to see loads of red text and now the bot won't attack. It just runs around with stampede. I have uninstalled everything and re-downloaded the latest...