What do you do after ten minutes? Do you charge it and then everything is fine? If so, my bet is that one or more cells in your TX battery is not coming up to snuff. Replace the TX battery pack.

If on the other hand all you do is turn everything off for a bit and then turn it on and everything works again, my bet would be a bad final output transistor in the TX. Sometimes a bad one gets through. They get hot and then they quit working.

I'd box it up and send it back to the manufacturer for a looksee if I were you.

The other possibility is that your TX has a bad final output transister