The gearbox oil on the Audi boxes is for life.... however you can change it to see if it makes any differnce??
however it still could be a syncro issue which is still there but i cant see that the heat outside will have much to do with it really... as once the oil is hot.... its hot and a few degrees out side should not matter...
i would say get back to the dealer now while you still have warrenty as it may take a while to solve and prove to them!
RickT
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