I have an Omega Quartz Chronometer made in 1977. It keeps great time, within 2 seconds/month, unless I wear it outside on a hot (90F) day. When I wear it on a hot day, it will stop in about 1/2 hour. When I take off the watch, and leave it inside for a few hours, it will start again. So, I am wondering if the heat of being worn on my wrist on a hot day is causing an issue with the circuit, or if the sweat from my arm is somehow making its way inside the watch. I have never seen any signs of fogging on the face. Are these old watches susceptible to such things, or could it be another issue? Any help here would be appreciated. Thanks!