Chuck Yadmark

Any part of the chain could be suspect camera, card, card reader, reader cable I’d take a while to try to reproduce it then I’d try different combinations with each

yes, try cleaning the contacts first with a pencil eraser then a commercial product called Deoxit

yes , corrupt

the 610 will give you a little larger view, cleaner low-light images, and wider fov with your current lenses.

Example I bought a 5300 for 150 dollars.  There are some good bargains in the low end sometimes.   The worst thing I did in this realm is to buy a 7100 for 500 a few years ago that I knew was ...

I don't mind or care about gray if the price is significantly lower than any repair cost and therefore in the "disposable" range.

what do you enjoy/plan to shoot?

Howdy! If sports wasn't a major portion of my shooting I'd be downsizing to either Olympus or Nikon Z6

Correct imo.   You need to be able to articulate what specific issue or feature you wish to address/improve and why the new camera would improve that.

In my work, when there was this work, I carried 2 backups. A significant percentage of cameras will go very very far beyond their rated life. Having backup meant I could afford to let it go as far ...

Do you have a significant investment in lenses?  Because if not I'd really start with questioning the premise here.  I suspect a DSLR is a good idea but there are good reasons to look at the ...

I have had both of these though not at the same time and I did not think the 7500 was significantly better except with fps.

7500 doesn't have an AutoIndexing "AI" tab for the older manual lenses if that matters at all to you.

Pretty much, yes

I would be more comfortable if you could move up just a touch to the D610 which leaves most of the 600 problems behind

I don't think you can go too terribly wrong there The 600 has probably the best sensor and modern/current battery but has the potential oil spot problem The D3 is the best shooter for sure but big ...

The short answer is yes! The longer answer is faster shutter speed will help with the non VR and the AFS 70-300 VR is soft at longer ranges.   A few people here claim to have good ones that are ...

I'm going to guess by the camera you own there that you are interested in super zooming but want better quality than you have there. In which case you'll probably want the 28-300 which, though a ...

better, most certainly, under 300, most certainly not or I'd have one myself I did however forget about the 20-35 2.8 AFD which I had 15 years ago and I think I'd still have had I peered into the ...

Nikon 18-35mm 3.5-4.5 AFD is okay for the price.  can find for under 300.