I purchased a Cloupor T5 50 Watt from an online vendor. I received it on a Wednesday afternoon and installed a fully charged Sony VTC4 and started using it. It worked fine throughout the evening. I charged the battery overnight. The next morning I was able to use it for roughly 20 minutes when it stopped firing. I was using an Aspire nautilus tank with a 1.8 Ohm coil. When it stopped firing there was a message on the screen saying to "check atomizer". I replaced the tank with another Nautilus and got the same error. I tried adjusting the 510 center pin (screw) by turning it out, Still no luck. I tried one of my Aerotank's and a Kayfun 3.1 with no luck. I turned off the device and turned it back on and it then started reading everything at 0.3 Ohms but still did not fire. I did send it back to the vendor requesting a refund. I also noticed my battery wasn't lasting very long. Has anyone else experienced this problem? I would like to know before I purchase another one.