so i'm starting to get things set up in my new house after about a year of being out of the fish hobby and i go to replace the bulbs and i was shocked to find one of the endcaps had started to melt and the plug in the bulb was loose and wobbling around. what would have caused this and how do i avoid this in the future? i was lucky in that it didn't catch fire but i'm sure it very easily could have happened. ???