I used to have a Seiko 5 (or 3

), but never had any problems like that.
It may be worth asking in the
Seiko forum over at Watchuseek or the
Seiko/Citizen Watch forum.
Those fine folks may have some ideas.
BTW, I would think your body heat should keep the watch well above any temps that would cause problems, especially for such a short time. There isn't anything inside of the watch (assuming the seals are good and there is no water inside) to freeze anyway. I would think it would have to be
really cold to make the lubes gel.