s670 sending a code saying I have low exhaust pressure and then putting combine into limp mode. If you shut it off and wait a few minutes it will reset. Also if you can push it real hard until the point off almost plugging, it usally will for some reason, reset itself but not all the time. Seems like it does it more when its cool outside in early morning or late evening. Also seems like it is wanting to do a burn a lot more. can anyone help with the problem?