I'm glad to hear the second chip is correctly read/accepted by your printer, and that you're ordering a set of spare chips to have on hand.
The length of time a chip will work, or number of times it can be reset varies widely. Chips are sensitive to static, and can be shorted out from static/electric shock, but a scratch or oils from your hands can also cause issues. Some people experience a higher failure rate than others, and I'm not exactly sure why, but believe it's somehow related to their environment or setup. In our studio, we have wood floors (no carpet), and maintain proper humidity levels for optimal results and function of all our printers. I use all our printers regularly, refill and reset carts when needed, and keep our machines (and printing environment) clean. I find it easier and quicker to agitate ink in carts by rocking the printers back and forth, plus this can possibly reduce wear and tear on the exit valves, chips, and printer's chip sensors (more friction can cause things to wear out faster), and reduce the possibility of air getting into the ink lines. Since we have so many printers, and print so much, I will often "shake" a printer before each day of printing, to ensure in-suspension pigment and consistent results. Daily agitation isn't necessary (but doesn't hurt), and we recommend agitating ink cartridges every 1-2 weeks to maintain in-suspension pigment.
In our studio, with six 7880/9880's, a 7900, 9900, and a 9800- all using our refillable carts and inks, I've had to replace I'd say less than 5 individual chips over the past 6 years with all these printers combined. I've also had a few Epson chips either arrive dead or wear out over that time (we're always testing). A few customers have reported frequent/regular chip failure with different model carts/chips, and have to frequently replace chips to resume printing, but I am not sure what's causing their frequent reoccurring issue. Some people have suggested wearing an anti-static band while working with carts, chips or other electrical components- which sounds like a good idea for people who experience a high chip failure rate, but I don't feel like I need it.
I know this is not a clear answer, but I hope gives you a better understanding of the factors and variables.
Please let me know if you have further questions, or there's anything else I can help you with.
Best regards and happy printing~ Dana