Just got a pack of the CE3 XLs last week. I have all 5 in rotation and I keep coming back to my buzz pro standing there with a top cap full of juice and a half empty tank on the CE3. I've taken them all apart to clean them already - all are securely together and I never let any air in while filling them upside down. I also use juice thats predominently VG and I can't figure out why this keep happening but I'm starting to get really frustrated. Any ideas??