RX Number 1 sometimes "loses" MT Number 3, for some reason I don't understand. It will give me "atomizer low," sometimes in the middle of the hit. Turning it off, loosening the tank, turning it back on and screwing the tank back down fixes it. I have just tried cleaning the 510 with alcohol and a Q-tip. We shall see if this fixes it. MT Number 3 gets a bit "weepy" occasionally. I wouldn't call it a leak, exactly, but you do get some vapor condensation in the air holes, so maybe it got a drop down in the connector. BTW, In case my earlier cheer leading posts didn't get the message across, I am really liking the 3.0 firmware upgrade.