Hello friends i have some problem with my audi a4 b8 1.8t 2009

When hot day outside is hard to start the car and some tome is turn off . And only secont time is succses to start.
I have change the coolant temp sensor and still same problem.
Ita happens only in summer

 

I think there is an air temperature sensor near the throttlebody on that engine. If the air temp sensor is giving false readings, it will cause the same issue as a defective coolant temp sensor.