Recording may stop even if the maximum clip length has not been reached on some memory cards.
It is recommended that a card with a speed class of 4 or higher is used with the camera.
If the issue persists you are recommended to try another memory card or reduce the quality of the movie clip being recorded.
You can also perform a [Low Level Format] on the card to see if this addresses the issue. Please note that a [Low Level Format] will completely erase the contents of the memory card and will also prevent the data from being recovered.