Maybe they should also replace the wing bags. (was that thread on here or another forum?).

Seriously, with the information I have about this incident of yours, I would asy they definitley should NOT replace your plane.
What information have I got? - only what you have posted here on this thread.

What radio (tx & rx), what engine, what was the installation like, what batteries, what switches, how was the wiring secured, how many and what servos, what was the previous service history of the components used, how did you perform the ground (range) check?

Whilst I may be known for sometimes being one, I am not trying to be a smart*** this time. The reason for the questions is to help you to work out the true cause and if there is in fact a responsibility on behalf of a component manufacturer or not (The TX and RX are only components of the plane as a whole.).

Was your spark plug cap correctly installed? (how so?).

Even the mighty 2.4g systems (any brand) can cop interference or loss of control from the above. I still stand by the "Initial ground test of a new airframe on FM then change to 2.4" system to give the best chances of solid radio linkage.

I too have had unexplained losees of planes on 2.4 but most of the losses I have experienced have been traced back to human error on my behalf. Poor installation or maintenance usually (never dumb thumbs - it is always the radios fault).