send them the radio for warranty service I dont see any problem, let them decide if they want to fix it over and over again...
I have 6XM sent them under warranty and they fixed it different problem though.

just remembered a piece of junk motor I bought years ago (not from tower) It didnt work well so I brought it back and the guy trying to give me a new engine of the same kind instead, well what is the difference?
if the first one is a piece of junk what make the next one work better?
why cannot you give service to what you sold me?

If they are willing to fix their radio its a better sign, its futaba by the way, I'm very happy with mine.

Alex