cavailer hot start probulm v6 ?

hi my vauxhall cavailer v6 will start grat when cold or warm but if it gets very hot it wont start if u leav it more than 10 mins u have to wait 4 a houar when it dose start it will miss fire its had new plugs leads coil no waring lights on but if u leave it hot 4 say 5 mins it will start pleas help this it now getting on my nerves ples email me on