My iPhone 6 keeps going down in percentage when I have it plugged and i have to keep my charger in a certain position?

My iPhone 6 keeps going down in percentage when I have it plugged and i have to keep my charger in a certain position?

You have to change it.

Yea had same problem before and had to end up buying a new charger

Clean the port

Your charger needs replacing. The cable is shorting out.

Hard to say what it is. It could either be the charging port that is bad or the battery. I know on my previous cell phone I had issues with the charging port. I suggest either taking it to your local cell phone provider store to have someone look at it or take it to a local cell phone repair shop for them to look at.