Seeking advice as a new Sony owner - Did I get a faulty unit?

[Sony-G-Man]

 
Hello! I was hoping I could get some advice about my Sony A7r lll. I bought it a couple weeks ago and I am concerned there may be something wrong with it. It is a certified refurbished unit and it only had 1 picture taken according to the shutter count.
 
QUESTION 1
I shoot RAW (ARW) & JPG simultaneously and I am noticing a lot of bright random colored pixels in all my RAW images, but not in my JPG images. I would assume this is just noise from using higher ISO (about 4000-5000 ISO) but I would think I should see the same thing in my JPG images. I have attached some comparisons. You will notice that the ARW images look darker, more saturated, and they have terrible noise, accompanied with random colored pixels. 
 
QUESTION 2
I also feel and hear something moving in my camera body if I slightly shake the camera. Is this just a byproduct of having in-body image stabilization?
 
QUESTION 3
I was shooting some video today and I noticed subtle horizontal banding in my display and the recorded video (seen in the last image/screenshot circled in red). The banding travels upwards. Settings are listed below..

• File Format: XAVC S HD
• Record Setting: 30p 50m - Changing this didn't help
• Silent Shooting: Off - Changing this didn't help
• e-Front Curtain Shutter: On - Changing this didn't help
• Anti-flicker Shoot - Changing this didn't help

 
This one is especially odd since I have shot both photo and video in the same conditions previously, with no issues. Now I cant do anything to get rid of this banding. This happens in auto for photo mode and video mode. I suspect I may have changed a setting somewhere without realizing it, which is causing this problem.
 
Are these signs that I got a faulty unit or are these things normal? Thanks in advance!

 

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[thebeardedgroundsman]

Q1

The difference between RAW and Jpeg is that RAW data has had no processing done to it - allowing full control of the editing to you, whereas Jpeg has some processing done in-camera, which often gives a more pleasing photo than a non-edited RAW image but does not allow as much scope for you when you edit on a computer. Effectively you have handed over some of the processing to an algorithm written in some far off computer. You will see how much smaller a Jpeg file is to the RAW file, which gives an indication of how much information has been lost.

Most people who like their photos "out-of-camera" will shoot Jpeg - those who like full control of the creative process shoot RAW. Those who like a back up shoot both.

Q2

The noise from shaking your camera could well be the few moving parts, including IBIS.

Q3

I don't shoot video.

So, as far as stills photography is concerned, I would offer you reassurance that your camera is good.

[Pieter]

I concur with @thebeardedgroundsmans answers. What's more, a high megapixel sensor like in the A7RIII will show more noise on pixel level than an A7III (24MP) or the A7S (12MP).

Regarding the banding in movies: what shutter speed did you use? A shutter speed close to the frequency of artificial lighting will cause banding in the footage.

All in all, nothing wrong with your camera I'd say.

[VTC]

Banding due to artificial lighting. You'll never see it in daylight.