I've had my Galaxy S5 for about 2 months now...I am not at all rough on the phone. It does require a charge at least once a day, so that's about how often I open the charging port cover.
Well, the cover has since broken off and, based on a few internet searches, it looks like this is a pretty widespread problem with this phone. Is this a part/repair that can be done at a local Verizon store? Is there a plan in place to address what is quite obviously a device flaw?