I've had my P3 4K for a week. I've had corrupted files twice. 1st time, I was not aware that sudden power off tends to corrupt files due to insufficient time to write it to the card. Today however, I kept P3 on for 2 minutes after landing/stop recording. Unfortunately, I got corrupted file again. Is there a time to keep the unit ON to make sure it saves all okay to the card? What is the best practice here. I use Sandisk Ultra 64GB card. Anything else I should watch out for? Thanks.