Dear member of SanDisk Community, welcome.
According to Toshiba , the company that invented the technology, the memory cells in the solid-state SD card can only go through about 10000 write/erase cycles before the hardware is incapable of retaining or updating its data.
Though this is a proven limitation, it may rarely be a major problem for you since it’s equivalent _to completely writing and erasing the entire card’s contents once a day, every day for 27 years. _
At Home, also SD Association states that its theoretical duration is 10 years or more, and 10000 cycles of read / write.
CompactFlash cards were developed by Sandisk in 1994, and support dual voltage and will operate at either 3.3 volts or 5 volts.
1- Check that the slot of the card, is perfectly clean and the contacts are not bent, broken or dirty.
2- Also you do not have overvoltage (3.3v and 5v), so that the card does not overheat.
3- The cards, like any electronic device, have a lifespan.
We have, on average, minimum:
~ 20 Uses x days in 25 days => 1 month = ~ 500 monthly and in 12 months= 6000 uses.
Then, in 2 years => 12000 uses (cycles of read / write).
It really is wonderful!!
Luck, and then you tell us, what happened, please.
Regards, Alfred. (Google translated)