My car sometimes won't start.. I wait 15 mins to 2 hours and then it starts fine

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My Amanti / 2007 won't start sometimes.. Yes it would start normally but sometimes it would not just start at all. If I moved the keys it won't make any action at all, no sound, no movement, nothing.. however there are lights on dashboard, headlights and everything is fine, so I assume the battery is fine. Then if I waited sometime (like half and hour to 2 hours.. its random) it would start as normal and again work till the problem comes again. (which is lets say once a week) I live in the desert and an extremely dusty and hot environment (Middle East) so I suspect it could be heat, but I am not sure. What could be the issue and how can I start troubleshooting it ? If I take it to the mechanic, I can't create the starting problem there because its sometimes. And ironically in front of the mechanic it would always start fine :(