I hope you guys are using High/Max Endurance SD cards, not the normal "high quality" cards like Sandisk Ultra. if you use standard SD card, even thou they are very fast, U3, top card, it will fail in a few months, or weeks. They are not intended for continuous writing. There are many types of SD cards, but the most popular are Standard (TLC / QLC): Very fast for read, ideal for Phones, DSLR cameras, or devices that you write little but read a lot. High & Max Endurance: for CCTV or continuous writing usage, often use MLC or heavy 3D TLC pSLC for the chips. The problem is that prices are crazy lately because of memory Chip shortage, every memory chip is now going to AI packages or to EV controller boards in China. A 64GB High Endurance are going for 1200 baht, a month ago it was 1500 baht, so prices might be going down. It was just 400-500 baht 2 years ago. luckily I got many 64GB high endurance cards before for stock :)