DeLonghi Eletta Explore Leaking

We got our DeLonghi Eletta Explore about 2 years ago. Over the last few months, we wake up and find all the water from the tank has leaked on the counter and floor. I believe it is the gasket connecting the tank to the machine but am not sure. I found if I slam the tank into the machine, it never leaks. It tends to leak when my wife replaces the water in the tank and does not slam it in.

Has anyone seen this before? Is there an easy fix?