Lot night lights are a little temperaMENTAL (help)

[thingfishs 416]

 OK, well -yoshi- is learning how to BAT, and is doing a great job. But was having some issues with night lights not working so I said I'd take a look, figuring it would be an easy fix... I am, however, baffled by it's behaviour. One minute they work, one minute they don't...?? I have photos:

In this first shot none are lighting up at all. (his is the sign overhanging the road)

In the second shot we have them randomly distributed over three different surfaces, why do only those on the disused agricultural lots turn on?? (granted some of those on the grass might be lacking power, but it's not as straightforward as that.

in this third shot some are lit up and others are off. But on this stretch of them, (and to my observations thus far, this stretch only) turn off, then turn on again - like timed props...

In all of the above examples I had the game on cheetah mode and observed them over a long time. I also swapped between day & night to make sure they were setup (or not as the case may be) I've looked them over in reader and everything (bar the occupant size) seemed in order (but I'm no expert)

Can anyone shed some light (groan) on this for us?

thanks 

[Nuclear550 3]

This also happens without the night lighting on Maxis buildings. I have no idea why they do this but I know it is the game not the night lighting.