Thank you for the good suggestions. There is no fuel filter mentioned in the manual, I have cycled the tank x 2 since I have had it, so hopefully stale fuel is flushed, but maybe a good flush could clear out any impurities.
As it is fuel injected, there is no vapour lock? but maybe a vacuum lock due to blocked tank vents? But why when it is hot only? Mybe the heat is effecting some tubes that vent the tank? Either way burping the tank sounds like a very good test. And I will wait to self test b4 starting.
Not sure about the CO settings for OZ, but I will ask the dealership. I plan a big ride in hot weather thsi weekend and see how I go!
Cheers