I downlaoded a 32G file from my Osmo action onto my smartphone.  What I ended up with on my phone was 8, 4G files.  And they playback at a high speed.  
Any way to correct this?  It's very frustrating!

so this never happened before? or is this your first time?

Hello there bwhippie07. Good day and thank you for reaching out. The maximum capacity of a single file will not exceed 4GB. If exceeded, the recording will be stopped, and a new recording will be started. In addition, the maximum file size of FAT32 is 4GB. Hence, a file that is larger than or equal to 4GB will be divided, otherwise, the file may be lost or abnormal and cannot be read. Although exFAT allows a larger file size, the larger file may be damaged due to abnormal power-off and SD card removal, or even cannot be recovered. So the storage of the camera is 4GB regardless of the file systems. So it is normal the video will be split if it reaches 4GB. Thank you.