Hi everyone, i leave my adapter plugged in most of the time i use my mac. recently, i noticed that the charging LED light takes time to come on (or it goes off and comes back in about 5 secs). This has only recently started. My mac is almost 2 years old now. What could be causing this problem and should i be worried about this? i am assuming this is happening because i keep my mac plugged in most of the time and hope this is not a logic board problem.