Does your charging port look like this, with two pins one on top of the other.

It should have a plastic post in the middle with those pins contained inside.

Odds are if you carry your laptop around a lot you've bumped the plug and it broke that post out and your plug suddenly got all loose and wobbly.

The first step is to buy the replacement DC jack.

Then check out the remaining steps to replace that worn out DC jack with your new one.