Yes, I had this issue. I'm not sure how to stop it since we still have it at times. When I'm petting her and she grabs me I pull my hand back, say no biting and don't pet for a few seconds. Sometimes this works (ok, it's worked twice) and other times it has caused her to jump towards my hand like we're playing a game.
There are some other posts about biting and the "landshark" stage that people recommend. I don't have links on my phone, but I'd check the sticky topics, and do a search for "landshark."
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Mommy to Seven, a shelter pup adopted at 7 weeks. DOB 04/13/2012.