Just like one or two months ago, I had noise coming from bottom bracket and my LBS changed it under warranty. But after few rides (not exactly remember how many) I had a little movement on BB. It makes a click move but w/o noise. Investigated and saw that entire BB was moving inside the shell. I brought it to shop and they tightend it and problem solved for a little while. Now it is there again but less, and I am worried about threads are stripped. Bike is still like 17 months old and it's under warranty. Anything else could be but stripped threads? Thanks.
Edit: I brought my bike to LBS and try explain the situation. The shop owner and mechanic had a ride and they saw nothing problematic. I gave a little bit more explanation to them and show how I can feel it. I am not sure they did but shop owner said there is a millimetric play but again I can't tell if he felt or trying to convince me. They remove BB, greased again and reassembled. In process, I noticed when mechanic inserting left side cup he had a little bit hard time correctly, It looked like not want to go in. After he put correctly, turning it was easy. He didn't use tork wrench but he used a pistol like they use in Formula1 pit stops. I don't know well if it is torque density but I hope they tighten it correctly. No problems for now. Thanks everyone for their help. I hope it won't occur again. Sorry if my grammar bad.