Have you tried to clean the grinder? If you have used oily beans, the burrs can become clogged, and when the machine tries to grind, it is not able to complete the dose. Then the machine dumps to start again. This is a frustrating feature, but if you remove the beans and vacuum out the chamber, that may solve the problem.
Answers & Comments
On the brewing unit there is a yellow plastic piece. It has two settings. Push it up and insert the unit back. It should work now.
Have you tried to clean the grinder? If you have used oily beans, the burrs can become clogged, and when the machine tries to grind, it is not able to complete the dose. Then the machine dumps to start again. This is a frustrating feature, but if you remove the beans and vacuum out the chamber, that may solve the problem.