When you do research you need to not only identify the problem but then you need to construct a solution. If there is a heat problem then defining what exactly is being affected and what to do about it might take 3 weeks.. maybe longer?
Until then MOVE the reciever into the shade. How hard can that be unless You have a carbon body then that might make it difficult to find a suitable place. If that's the case then shielding within the canopy might be possible as Gray suggested. I'm flying the 2.4 and so far.. no issues. I also put my recievers inside the aircraft..