Samsung SPH-M610

I currently work for a indirect cell phone store and a lot of our customers seem to be having problems with the charging port in this phone. The problem seem to be that the charger doesn't fit properly into the phone's port, causing the customer to have to hold the charger into the port in order to recieve a charge. We are trying to figure out if this has been a problem with all of the phonesor if we just got a couple bad apples so please leave some feedback.. Thanks!!