Possible defect - INFORCE WML Gen2 Weapon Mounted White LED Tactical Light, 400 Lumens

I initially purchased this product for use with my shotgun after using it on a friends rifle. I have a bit of experience with various other manufacturers and thought I would give it a try.

Initial impression: The WML is lightweight, ergonomic, and a streamlined design. It mounted well to the picatinny rail and held tight. The beveled switch on the back end is angled well for operation without much hand adjustment on the foregrip

Issue: Upon turning the light on in constant mode, the light kept flickering as though there was a bad connection. When flipped into the press activation mode it also had this difficulty. After about 30 seconds, the light flickered into a barely visible glow before it finally shut off. Upon trying to reactivate the light, the soft glow would flicker momentarily before extinguishing entirely. Ate this point I figured there was a strong possibility that either the battery was making a poor connection, or it was dead entirely. I cleaned the connections and no response. So I went to the store and bought a new battery pack and installed them. Upon putting the new battery in, I got a single bright discharge for a fraction of a second and then nothing. After trying multiple things, I am still unable to get the light to respond leading me to believe there is a possible defect with a connection in the light itself.

Needless to say, while my friends works great and others seem to have had a positive experience, I will most likely be returning this product and going back to another manufacturer.