Your engine died after you lost control, so likely you have a radio problem. If it's not the batteries, do a range check. You tx or rx antenna might be broken, if it fails, try the same with a different rx, so you know where the problem lies.

Also check your servos. I once had a short in a servo, worked fine most of the time, Just sometimes it 'cut out' and I eventually stopped working. I saw the rx didn't bind anymore, so I replaced it. Shortly after that the new rx died again. One servo had a little whole burned through the case. Lesson learned