Okay, i know that not all of our phones have been as reliable as the STARTAC which you still see some people with because that thing is the tank of phones, but here is an example of a "bad" phone.
You crazy lg guys thought you were getting off easy didn't you? the LG series 3 port, found on many models but most notably on the lg 6100, lg 5200, and lg 8100 have a little rectangle which is attached to the housing of the charge port and allows for the charger to click into place. The problem is that any prolonged tension from talking on the phone while it is plugged into a car charger or other ways will over time weaken the port and cause the rectangle to fall out. If you notice it, no problem. it will be exchanged under warranty or if it is over 1 year old then just super glue it back in place.
The problem occurs when you don't notice it, and try to put the charger in the port which effectively destroys the copper contacts making it impossible to charge. Most techs will still offer the 50 dollar out of warranty exchange but if the port is damaged, you ain't gettin' it for free.