Good day! Can you describe your case more specifically?
I have two. XHP50 Warm and Nichia. Both are wonderful and are my go-to lights for DIY/repair work and camping. But like others have siad their CS deserves the reputation. I had one tailcap fail on me. The glue debonded and the entire assembly fell apart when I removed it for cleaning. Since these don’t have any type of retaining ring it just fell to pieces. Easily repairable but when I reached out to AT asking what orientation each piece goes and if its OK to glue them back together (after explaining what happened) not only did they offer zero help what so ever but they blamed me for intentional disassembly. I like their products- more or less- but the price is a bit steep and the CS plain sucks.