Today on family vacation I have used the 4K video shooting for the first time and I have noticed that recording of the videos in 4K will stop by itself after 4-5 min of shooting? I did some Googling and I see that some other phones have a time limit with 4K but apparently iPhone 6s doesn't. At least based on some comments which may or may not be accurate. Really couldn't find any solid info. Is there a 4K time limit when shooting video with 6S that I was now aware off? The phone was not overheated or out of space. It did not turn off or show any warning messages. Video would just stop. Not sure what is going on? Anyone?