HELP!! I just purchased a 96 Discovery and am awaiting an ordered Owner's Manual but when I drove it home last night it popped out of High Range on the Freeway 4 times! Has anyone else had this problem or know how to fix it easily...maybe I'm doing something wrong. When we test drove it it did fine. We did put it into Low Range in the parking lot to make sure it would engage...and it did fine...and went right back into High Range...but then when we accelerate in the higher gears...it pops right out of High....Please help!