Solutions：
This warning may be caused by the following reasons:
1. If the memory card fails, users are advised to replace the mainstream memory card or the memory card with faster writing speed. It is recommended to use the high-endurance memory card of 16G C10 or above.
2. The memory card has been used for too long without formatting, resulting in too slow writing speed. After the writing speed is too slow, the cached video file cannot be recorded.
3. It is suggested that users backup important video files regularly, and format the memory card every two months.
