Serious design malfunction - Pelican Mitylite Plus 2430 4AA Xenon Flashlight

We work with these flashlights every night on military contracts and this particular model3out of4 flashlights after the first set of batteries. have gone weak when you replace the batteries and turn the light on the bulb will blow out every time these bulbs are not replaceable so the lite is thrown away 3 out of 4 flashlights do this