When you loose coolant do you top it up after?
Be careful to only fill the tank to the correct line marked on the tank.
I mention that because if you overfill the tank it will always barf out the surplus while you are slowed and typically parking the car.
I only had this problem once when I decided that the coolant level needed to be near the top line and the car was on a bit of an incline so on level ground it promptly barfed the rest out after a drive while parking.
There was no issue, just too much liquid and not enough expansion room in the bottle due to my overfilling it.
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"It broke because it wants to be Upgraded

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2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)