Hi Alex!
Thank you for your answer! I cut and paste on my computer all the files. I don't think the card is full because in 1 night it records around 17GB and I have done around 15 nights. But for tonight, I tried to reformat the SD yes, so I will be able to give you an answer tomorrow! I hope it will sole the problem!
I don't think the cards are SanDisk Extreme. And the one I replaced is now a SD card with no brand and I have no issue for the moment. So I don't really know, I try to explore the possibilities