Battery and starter is out of suspicions since they are new, I would highly suspect the fuel system ..

I still remember that I used to have a toyota corolla where it has the same problem (( Doesn't start in the morning normally or when I leave it not running for a long time during the day , but start normally in other situations))

Anyway, what happened at the end is that I had to change the fuel filter located under the rear seats , and I am not sure if it's the same setup as the wira .

The mechanic explained that the fuel filter maintains the pressure high between fuel tank and injection .. If the filter is spoiled, the fuel will be drained all the way back through the pipes to the fuel tank .. So, in the morning the engine is trying to get the fuel all the way from the tank instead of finding it pressurized at the injection ..

At the end, this is only a "maybe" but it's worth checking out

Cheers