W520 only charges with docking station wall plug does not work

I have experienced this problem twice and am very confused about why it is occuring. 
I usually use my W520 laptop on a docking station and when I am at home or travelling I keep it powered by with a wall adapter.  So at work it stays charged and operating from the docking station (i.e. ports on the bottom of the laptop).  When I am at home it stays charged by pulling it in using the Lenovo (170W power adapter).
Last year I was in China working and all of a sudden my laptop would no longer charge and would shutdown when the battery died) with the wall adapter.  I ended up buying a docking station and managed to keep it charged and operating that way.  Obtaining any type of warranty service in China was a major pain but the problem was diagnosed to be an issue with my motherboard.  I returned to Canada and had my computer replaced (computer was about 3 months old).
Now I am back in Canada and have the same problem with my new replacement laptop.  I am puzzled why this keeps happening.  Has this occured with anyone else?  Is the plug on the W520 not very good quality?  Any thoughts or suggestions will be super appreciated. 

Thanks for the reply. Actually everyone always thinks it is a problem with the power adapter cable but the cable I am using is the same one for my dock. I only had one cable for my dock and when I am travelling unpug it and use it when I am on the road.
Last time in China they took apart my computer and confirmed (I was watching them as they used the voltmeter) that power and proper voltgage was coming into my computer from the plug and all the way to the board (ie checking every interface along the way). Yet it was not charging the battery or providing power to run the computer. The only way to solv the problem was to use a dock. Only thing I could think of is that maybe something on the bottomdock connector is messed up and hence the computer believes it is connected to the dock and hence not wanting to provide power via the power adapter at the same time to avoid shorting out the board. Any thoughts?

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