Do the Touch Test.
The oil is leaking through the bowl and may be damaging the base plate.
Unless the ceramic bowl is cracked, the oil cannot leak through the base plate.
It is more likely that too much oil has been added, or water has been added with oil causing spillage, affecting the base plate.
What type of Oil are you using?
a. Is it a pure essential oil? Is it a respected brand of essential oil.
b. Is it a blend of oil? If so, what is in the blend?
c. Is the oil diluted in a base oil? e.g. Rose in 3% jojoba oil.
d. Remember to clean the vaporizer regularly.
Are you using water in the Aromamatic Electric Oil Vaporizer?
Have you cleaned the vaporizer recently?