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start up problem



This problem just happened recently...
normally it's only take 1 sec to start engine but now 2~3 sec (I guess) for cold start. After that I park my car for 2~3 hours and start again it's just normal as before but not for parking more than 8 hours (or engine cool down?).

Spark plugs:ngk Iridium IX MAX which was replaced at 20,000km ago so should be fine for another 10,000km. Might take it out and check soon.
I also got the battery charged and start engine again but still take 2~3 sec.
Now I'm not sure if starter motor has problem or fuel pump and causing fuel pressure unstable at the first start??

Anyone know the problem?