Nikon D7200 M Mode shutter speed?

I just got the new Nikon D7200 and love shooting M mode but recently my shutter speed has been automatically changing. It wasn't doing this when I first got it. Any suggestions on how to fix this?

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What is a must have lens for beginner photographers?

I am trying to teach myself basic photography for personal use. I own a nikon d5200 with a 18-55mm lens. Main use would be to take pictures of family and my cousin wants me to take a few of her senior pictures for practice. What would be your must have lens or accessories?

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Are these Nikon lenses good?

Im thinking about buying a Nikon d3300 with the 18-55mm lens that comes with it. My first question is, are the lens that come with it good for general photography and will they be able to capture good detail? Also im thinking about getting an extra lens later on, probably this one here:

https://www.jbhifi.com.au/cameras/Lenses/nikon/nikon-af-50mm-f1-8d-af-lens/25181/

Is this any good, or is the same quality as the one given with the camera? Because if it isnt that good i might save up for this one instead:

https://www.jbhifi.com.au/cameras/Lenses/nikon/nikon-af-s-dx-nikkor-35mm-f-1-8g-lens/24106/

Thanks,

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