Thanks, dudes, for the help. The ECM suddenly dissapeared. Nothing changed, the old EM were cleaned, then reappeared, new clean process of the ECM, and so on for 3 times. And one good day, they dissapeared.
The worst thing of these troubles is that you don't know why they did. So the next time it suddens, I won't know what to do. Waiting to spontaneous cure?