Hi!
Few months ago, my tablet fell down from the table, while it was charging; and it landed on the plugged in charger pin. Since then, I had the same problem as you, I had to apply force to the cord in a specific direction, to get the tablet charging. Today I finally got the courage to open my tablet up, and I discovered, that one of the pins of the charging port was not properly connected to the board (see image).
Somehow, I managed to solder it back into place, and now it works just fine.
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