Saeco 8 cup coffee maker with ceramic pot

a weird problem. Every so often, our ceramic pot leaks. The coffee brews ok, goes through the center hole in the carafe lid and then starts to leak along the outside of the lid. It looks like as if there is a pressure build-up inside the carafe which forces the coffee out while brewing. It's not caused by overfilling as the leakage starts half-way during the brewing cycle and if the maker is not turned off immediately, about half the contents of the carafe leak out.
This is the second saeco venus we got from starbucks, the first one had the same problem. ANY ANSWERS?