Over time the pins, tubes, and even the links can wear to cause these parts to become loose. Although you have had this watch for 2 years, it's clearly a lot older than that, and depending on when and who did the last service it may or may have had the links fixed up. I always check all the pins to see if they are loose, and Omega even makes a tool specifically for this, but I just check them using my own judgement. If I can move the pin just by pressing on it, it's too loose and I replace the pins and sleeves for those. Sometimes the wear can be quite striking - this is a tube that is nearly worn away:
And this pins shows significant wear also:
And even the link is worn on this one:
Sometimes things are so worn out that really the bracelet should be replaced. Taking good care of the watch is important to help prevent it from getting this bad, so making sure you keep the bracelet clean is a good idea - once dirt gets inside the links and between the pins and sleeves, it acts like an abrasive compound and speeds up the wear. Also if you wear the bracelet really tight, it will increase the pressure and accelerate wear.
Cheers, Al
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