Would be a good idea to check how close you are to the write limit, then. Pricier cards have a higher write limit, but all SD cards are limited.
Luckily, once you hit the limit, it turns read-only, so you can move to a new card pretty easy, but it will happen eventually.
Neat to know you've got a longer life out of the card you bought, though! I'll have to look into cards that have a higher write limit for my next Pi project!