Hi guys, I am a new user of QCM and I am having trouble reaching equilibrium. I have isolated the chamber from air flows and vibrations, the crystals are clean and all the other removable parts have been cleaned as well. The real problem is that sometimes I have managed to reach equilibrium by doing the exact same steps but 4/5 tries the frequency just giggles around in both air and water interfaces. I do not know what else to try. If any experienced users of QCM have suggestions, they would be very welcome and I would be very thankful.