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Assuming you were in "Position" control and not "Draft" control mode (and it sounds like that was right), and that you are not low on fluid: The I&T FO-20 manual does a pretty good job of describing 3-ph "bobbing" and other problems. First, with the implement raised, remove the filler cover under the seat and examine the inside of the big cylinder to determine if you are leaking oil out around the seal.
(The warmer the oil is, the thinner it gets, and the more it leaks, so, the bobbing tends to worsen the longer you work.) I'd go on, but I think you are likely to see oil squirting around. You need a lift cover gasket, a couple o-rings, and somebody to help you put the lift cover back on, in addition to a new seal and backup seal.
(One seal is a big o-ring, the other used to be leather, but may be made of something else now. My FNH guy still had the leather two years ago.) Post back if you don't see oil flowing.
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