Those stock lights go out very easily, at least the power source to them does.
Sometimes by just flicking the circuit board, they will come back on. Mine on the other hand took a little more than that. I checked the four multi-fuses in the interior fuse box, and one was blown, so I replaced it and they worked for like a day. The fuse is fine, it's just that the circuit board is very fragile, and I can't find what connection is faulty on it.