Is it possible to fix a Core Equipment 1250 multi color flashlight?

I have a Core Equipment 1250 Lumen Multi-Color Flashlight. It takes 9 batteries (which I changed, just to rule that out). It will stay lit, but only if you continue to hold the button on the side. I can cycle through each mode, with the same results. The only end that unscrews (that I have this far found) is the end to install the batteries. The remaining body of the flashlight appears to be a single piece (aside from the button). Help!