not had the problem, but bulbs shouldn't be burning out that quick, so your thoughts sound like that could be the problem, its under warranty so get them to check it out. Not had to replace one bulb on my previous KIA in four years of ownership and not replaced any on my current Soul after 3.5 years of ownership.My wife's 2013 soul 4u still has a back up camera that doesn't work, just a black screen with the warning lines still showing.
I noticed also that the little side brake lights, the ones in between the top bigger lights/bulbs and the bottom ones are constantly burning out. I'll replace them, a couple weeks goes by, and I notice they're burned out again. I think there may be a wiring/short problem with her hatch or the wiring going to the rear of the vehicle.
Anyone else experiencing this issue?