Battery charging for MacBook Pro sometimes does not work

sometimes when connect charger macbook, not charge, , screen battery says not charging.
light on charger blank without lights. have push charger charing start.
there way can fix problem? isn't problem, nuciance pushing charger everytime i'm charging computer.

oh, , charger l-sytle charger.

 

having same problem (early 2011 13'' mbp). don't know what's causing it. unplug , plug again.

 

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