I bought the GP-1 at the same time as the D7000 and for several months it worked perfectly, although it is very slow to lock in. Now, after several months of use the GP-1 has a habit of disconnecting itself from the camera. I noticed that the connector on the camera side is very loose, and I can ususally get it to work again (for a few minutes) by jiggling the connector. I have already replaced the cable (at a hefty $75) to no avail. Is anyone else having this issue? Does anyone know a solution?