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LONGINES GEMINI II

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WATCHADDICT

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Hello. I was wondering if anyone was familiar with the Longines Gemini II from the mid 70's. it has an LED and a LCD on the watch. Anyway i noticed 3 weeks ago that it was slowing down keeping time. This i do not understand since the two displays are very bright so it can not be a power issue. How can a solid state timepiece such as this slow down in time? it is slowing down about 15 minutes an hour. all functions work but the time is not keeping accurate. I took it to my watch repair man and he did not know much about these and i suggested new batteries but he said if the displays are powered fine than it is gettin power to keep time. Any one see this happen in these mid 70's solid state time pieces? Thanking you in advance.

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