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@DrivenDaily is giving you good advice - get the codes read in your vehicle, there will be clues.

I had a similar situation once which turned out to be a sticky thermostat. As engine heat built and thermostat was stuck closed, pressure would build on the upstream side of the thermostat, levels in the reservoir would rise to tippy top. When I shut the car off (either due to the car cooling or the thermostat opening) the level in res would return to something more normal or a bit low. However, in my case, I could smell the coolant and would sometimes have a small puddle under the car.

Anyway, get your codes read
 
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