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How old is your reservoir? Has it ever been replaced?
My 2001 Boxster S did the same thing and it got worse overtime. If your tank is yellow it is time to think about replacing it before you end up with a pool of coolant under your carpet. Little cracks develop all over the bottom of the tank over time. It's not the easiest part to replace but its worth doing. After I replaced it - zero coolant loss.
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