This is a classic problem for me as well. Can't seem to get this..
As stated by the title, I have been having a problem with my week-old Canon EOS Rebel t3i. Now I've been attempting to record video with it, as that is the main reason that I purchased this camera, but I keep getting an error.
After recording video for roughly 30 seconds-3 minutes (Depending upon randomness as far as I can tell, as well as quality; 1080p vs 480p, etc.), it stops and an error pops of saying, "Movie recording has been stopped automatically".
Before responding, note that I have researched this already. I have a SanDisk 16GB Ultra Class 10 SDHC 30MB/s (bought in store). I freshly format the card before recording. The most frustrating thing is that it was working only a few days ago... I don't think I've done anything unusual that would cause this, but I may be wrong.
Please tell me if I left out any relevant information. Thanks in advance for your responses.