Sub C bracelet links keep locking up and will not move

[bonsai-man]

I bought a black Sub C 6 months ago from my local AD. When I put the watch on in the morning the bracelet links are all moving freely, in the evening when I take it off usually at least one link has locked up. At its worst 2 or 3 links are locked up. I usually hold the 2 links and bend and it unlocks with a bit a snap. It has been like this from new, I usually have my watches quite tight on the wrist but I have tried loosening it, but it still happens. I also thought it would loosen in time but it seems to be getting worse. It seems to only happen when I wear the watch for an hour or so. If I leave the watch in the box for a few weeks it does not happen. I assume from that it is not a lubrication problem. I was not expecting this to happen to a new Rolex and I am tempted to return it to the AD but I am not sure what they can do. Has anyone else had this or got any thoughts.

Many Thanks.