I typically always plant my fields with the headland option and make two passes and then plant my ab lines. Planting soybeans tonight and I had a couple of small fields that I opened the field and selected the a b line instead of my headland. My 700 receives its gps signal from the 750. On the first round everything worked fine. On the second round when I was going across the a b line the planter started turning off and on as it came to each line. I had to put it in manual to plant the ends. I have had this planter and gps set for several years and I hav never had this happen.