Is it an adjustment issue?
I had an issue with my Perentie - a year after buying it the drivers door would fly open when you drove along (sometimes it would happen when I was driving in a straight line - the door would randomly fly open)...  
Anyway the issue was a combination of age and worn component.
Adjusting the front hinges, striker plate and latch fixed it.
It was easier to watch the latch/striker plate from the inside of the car as someone else gently opened and closed the door..
Cheers,
GG
				
			 
			
		 
			
				
			
			
				88 Perentie FFR - Club Rego
93 Discovery 1 200 Tdi - Club Rego
03 130 Td5 Single Cab
06 Discovery 3 Petrol
22 Defender 90 - Full rego
			
			
		 
	
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