Very disappointed - Steiner Laser Devices MK4 LED Tactical Weapon Light w/ TIR Lens

Bought the MK4 to work with DBAL-A3. Received light and construction appeared to be of high quality, what i would expect from Steiner. Tested light with push button and it operated correctly. Attached to weapon and connected remote switch from A3. Tested good. Placed weapon in safe. Pull weapon out 3 weeks later to do low light drills and it light failed to function. Replaced batteries and still failed to operate. Very disappointed. Contacting Steiner to correct.