All painted cabinets crack at joins in winter when it the humidity is too low. This is why all cabinet manufacturers require the us of a whole home humidifier.

Sorry to hear about your issue. By all means call the manufacturer and check your warranty but it sounds like a temperature/humidity issue, as in your indoor humidity levels may have fluctuated over the winter. Wood expands and contracts. The resulting finish breaks are usually much less severe than you describe and located at joints.