2012 Outback Cargo Light socket burned

Cargo light wasn't working in the 2012 Outback that belongs to the bosses wife. Pulled it down and the bulb was fine, but the socket housing was charred and the terminals in the socket were all black and crusty. Not fire crusty, just looked like they had been really hot. Forgot to get a pic of it. 

Cleaned them up, pinched the pins together tighter and put a new bulb in with some di-electric grease and its working. I informed her not to leave the switch in the On position. 

Wondering if this is a common thing, but I did search the google and couldn't come up with any complaints about this. 

I remember a few years back there was a recall on certain years for the lights in the door panels. I don't remember ever seeing anything about cargo lights though. 

Anybody else have to deal with this at some point? 

I might expect this to be normal on a 20 year old Legacy. But a 3 year old Outback that is for the most part in very clean shape, this seems out of place.