Kimi Raikkonen and reliability issues

Kimi Raikkonen and reliability seem to be synonyms. After an eventful courtship with Mclaren, where he had 30 retirements/DNF in last 5 Years (that is 6 per year... his record with Sauber was not great either, 7 retirements in a single year), he jumped ship and moved to Ferrari, which was known for its reliability.

At Ferrari, where he was replacing Michale Schumacher, the expectations were already very high. And till now, he is not able to match up. He has won the Australian GP, finished third in Malaysia and Bahrain... and living up to his old records, failed to finish in Spain.

I somehow fail to understand the reasons!! is it purely because he tries to get maximum out of the machinery and in the process forgets the limitation of machinery and blows it up??

Disclaimer: I am a diehard Kimi fanboy.