On the server I'm playing on, the item on the mechanical belts stop entering the funnels after a period of time. I found that breaking and placing the belts will allow my machine to function once more, but the problem reappears after awhile.

The flint shown in the screencap simply stops at the point where it would normally funnel into the drawer.

Also been experiencing this issue on my server. Only seen for us after server restarts of any sort (intended or crashed)

This should be addressed in the new version that went live just now.
Thanks for the Issue and feel free to re-open if need be.