I have numerous lights around my Sanctuary Hills settlement, but I will often find that random bulbs have gone out. If I go into workshop mode and replace them they come back on, so I know it isn't an issue with power (I have 66 power and the indicator doesn't turn red).
Has anyone else had this problem? I love what I've built, but it's very irritating having to replace my lights all the time when they go out. I am not using any mods.