That's true. Electronics fail at initial startup or when they first receive power of some sort due to quality issues with the product out of the box. If they work the first time, they tend to work over and over again without issue so long as there isn't something that's experiencing "wear" (like the cells in a SD card). So, in the case of memory cards, they either fail right away, or after providing the expected usage. Occasionally they fail in between, but not that commonly.
Since my card worked out of the box and was working properly for short periods when it was in use, I have no reason to believe that it wasn't working properly all along and should be continuing to do so.
I've heard that "beep" happen a few different times over the 18 months I've had the card. Once, it went on until I formatted the card - clearly something corrupted or was causing a significant issue. The other couple of times, it was a single beep never to occur again for thousands and thousands of miles. Absolutely no way to know why it was beeping, either. When I pulled the cards and inspected them, they appeared to be working properly and there was a few dozen files on the card including all of the mileage most recently driven.