My camera (not an actual camera but a smartphone), Sony Xperia M5, first corrupted my SD card.

I lost a few clips I hadn’t copied over to my PC yet. Formatted the card, checked with with Windows chkdsk tool and found 0 problems with it.

Then after that when I cut (instead of a copy, big mistake) some files from my phone it mixed up the file extensions randomly between cut files and some files were corrupted or just had wrong file name. So I couldn’t use some files at all because they were non-functional.

The problems continued and PC had shown some files randomly as 0 kb if the files were on my phones SD card or if I copied the files to my PC. I had to take the SD card out of the phone in order to read it.

Turns out the problem was with the circuit board of the phone and had it replaced with a new circuit board, all the problems went away.

Because of these problems I haven’t had time to upload my videos on time and the video from November 2017 was edited and uploaded without subtitles*. I don’t know about December 2017 videos yet because I haven’t started editing those yet.

*Subtitles contain the data from the video. Date & time, speed, GPS location, elevation.

Update

The problem re-occured. In order to get my files from phone to my PC I need to eject the card from the phone and read it using SD card reader on my PC. Don’t know how this will affect my future videos yet. I might need to invest into a new phone or downgrade to a “real dashcamera” with lower image quality.

After a few Google searches it seems that the problem is the same on a lot of Sony phones running Android 6, I don’t remember when I upgraded to Android 6 but the most recent software update a few months back caused the problem with the same symptoms as described on the thread I linked below – corrupt SD card (nearly brand new) and data loss after format using a PC.

More about Sony phones running Android 6 having problems with external memory cards here.

Update 2

My phone kept corrupting random files and I lost a lot of video files to the corruption so I went looking on the forums again and found out that the Android 6.0 cannot use exFAT file system and requires FAT32 instead. And the problem started with my newish (~1month old) 64GB SD card which by default uses exFAT and Windows cannot format that large file system into FAT32. So I had to search the Internet for ways to format 64GB SD card into FAT32 file system. Finally I found this tool which worked and now my SD card is using FAT32 rather than exFAT. My old 32GB SD card used FAT32 and I had 0 problems with the SD card with my phone using that, so let’s hope this works now I wont lose any files to Android bugs anymore.