N2 Pro Issues

[IamWedge]

What is the explanation for why they last longer if you reformat them? Do you have data showing that they do?

Here's some more info

7. Use Your Computer To Delete Your Files, Not In Camera​

Deleting photos directly from your card will actually shorten its lifespan. Hence, you must always delete photos, videos, songs, documents or any files using your computer. It’s an extra step, but fortunately it’s not that hard to do. In this case, more is less. You may constantly need to add new data to your card, but you can control how much information you delete. Hence, instead of erasing data on your card, opt to reformat your card instead.

9. Reformat Your Cards Periodically.​

It’s a good practice to use your memory card from time to time. This allows your device to write data on your card more efficiently. Formatting your card allows any corrupted files or data to be stripped away. As you reconcile any broken files on your card,

10. Format Your Card In The Device You’ll Specifically Use It For.​

As discussed above, you can avoid re partitioning your card by making use of a specific device. If your host device is not compatible with your card, you will end up having the capacity of the host device on your card. Because of this, it is recommended that you use a compatible host device. Make sure to check your manual for the brand’s recommended card variant.

As seen here: https://storables.com/data-storage/sd-cards/how-to-maximize-usage-of-sandisk-sd-cards/

 

[Nigel]

The best thing to clean the contacts on your card is a pencil eraser. Just the right amount of abrasion.

That seems a very bad idea to me, the contacts are gold plated, with a very thin layer of gold, if you wear that layer off then you will have serious problems.
The contacts are self cleaning, on insertion, so do not require you to clean them.
The pencil eraser contains an abrasive, pumice, which is softer than paper so does not damage paper, but is far harder than gold, so will damage the gold contacts.