My 2009 Lr2 runes good in winter. in summer if out side temp is over 95 it will starts sputtering or turn off. when sputtering I will park it turn the car off let it sit for 3 to 5 minutes will start up.if it shuts down it will take 5 to 10 minutes to restart. it will start all the time.Trips over 45min. are the worst. HELP

 

You didn't say anything about the coolant temperature indicator. Where is the needle when this happens? And is your radiator fan running? Can you hear it?

 

temp normal, fan working good every time it happens

 

What I would do next requires a good OBDII monitoring device -- I would monitor fuel pressure and see what it is doing when the car shuts off.