Are you shooting in low light conditions? It seems like the camera has chosen a slow shutter speed based on your chosen aperture. Slow shutter speeds are more discernible, it will seem like the camera itself is locking up.
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D700 & D7000 (both gripped) 80-200 2.8 AF-D 24mm 1.8 (sigma) 50mm f1.8D 85mm 1.8D Sb-600, some white lightnings, vagabond, gadgets, toys ,etc.
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