Mcdevito75 here, I hope you have a warrantee on your Tag Heur watch, if so, contact Tag Heur, if not, your on your own, (Sorry) sounds as though it"s lost some of it"s waterproofing ability or the seal around the crystal, usually a crystal sealer. Best Bet look for a small watch repair shop in your area, have them take a look at your watch. The Fog on the crystal is the tempersture change of the air in your watch, no watch is air proof, re-sealing the crystal should help, also, replaceing the rubber seal on the back of the watch.
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