Yesterday I was doing an overall check on bike and notice the headset was loose - I kind of remember having it wobbling some days ago.
I notice some grease had come out - so I guess I was riding for a good couple of days on this condition.
Didn't notice since I carry a lock cable there.

Is that common the headset to get loose?
I have some washers that can contribute to it, but I only have some 1000 miles on it after it was put together.