General Galaxy s2 battery problem ?

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http://androidforums.com – Hello , i brought my brand new Galaxy s2 gt-i9100 one mounth ago . The phone keeps crashing on black screen and i have to remove the battery so i can turn it on again . Another problem also occured 3 times this mounth ... for example last night i went to sleep and the phone had around 40% of its battery left . When i woke up in the morning it was completly dead and i had to plug it to the charger so i can get it to run again ... Its running 4.0.3 , not rooted ... I calibrated the battery using this threat http://androidforums.com/samsung-galaxy-s2-t-mobile/481966-my-samsung-ga... (General)