Red Walmart Neons...burning out...???

So I'm a big Walmart Neon light fan...I've got 2 red ones and one blue one.

My blue one has been chugging alone nicely for a long time now.

My red ones aren't as old. One is almost as old as the blue, and stopped working last week.

Then, a few days later, my new and uncased one stopped working.

I have yet to pull them out and see whats wrong with them, but I'm wondering if they burned out...

Anyone had trouble like this?

I kinda want to know what happened, mainly b/c I'm concerned if they do burn out or stop working that they don't end up surging the rest of the system...that'd suck!

Just curious...
Mike