I have a Bertucci A2T ( quartz with claimed 10 yr battery life, watch is 2-3 yrs old) and it gets regular use however it had a strange goings on the other day.
I was working away and took two watches, the Bertucci was in my work bag / car unworn for a couple of few days, I put it on and noticed it was about 2 hrs slow, set the time correctly and its still as accurate as ever (never seen any issue before). The crown was still fully tightened and, it hasn't had any significant knocks, no extreme temps and as I say, its as good as gold now and always has been except this one instance.
What could be the cause? Any similar experiences (I would assume if its the battery it would have lost time again or even stopped)?