Has anyone experienced this? I have a problem where my 635D repeats material under the center draper belt and spits it back out the front again. You can't see that it's happening until you turn around to see a row of cut crop left behind. It also has jammed completely a few times when it gets really bad. I have a theorie it may have something to do with the feed drum now being tapered at the edges rather than the same diameter right through like the 936D as it seems to be on the edges where it repeats. I'm having this problem in barley and it is worse when taking more straw. Any ideas?