Bought a Russel Hobbs Microwave and was concerned there was yellow liquid at the back joint every time I used it. My son and daughter in law took it back with them to try it for me and they discovered that food was tasting dreadful and smelt funny. They think there is a leak inside the microwave and instructed me not to use it as it could be dangerous to my health (75 yrs old). What are your comments regarding this please.