Hi! I purchased a D5100 last April and it has been working wonderfully, but last week when I had in it aperture priority, shutter priority, program or manual (any manual setting) the shutter acts kinda as if its getting stuck. It will close then take about 20-30 seconds to open back up and finish the shot. Kinda like its trying to do the bulb or time lapse photography. All of the other pre-programmed modes (auto, portrait, landscape etc)work perfectly fine, so I thought maybe I had accidentally turned on something that would cause this, but I have went in and reset all of my settings, cleaned the sensor, and made sure the time lapse exposure is off. Help!! Lol i have posted this in the repair forum too hoping i can find someone that can hell..advice would be appreciated!