Neon lights going out in limo

I own a limousine company and have a car that has two neon light that are approx. 6 feet each.....they started going off on their own....it I killed the power for a while they would come on......I am not familiar with the power system that runs the lights but I can see what looks like a transformer and two other boxes that have line fuses on them. Anyone out there know about these? Thanks in advance!

I can't really say from the info given,
But my guess is the transformer or ballast is going bad,

See if the ballast or transformer are getting really hot before/when it cuts out, If it is made with cheap solder then it will lose the connection when hot, this can be corrected by desoldering then resoldering all the internal connections, or buying a new one...