I have two of these. One that I bought a year ago, gloss black, and new one gunmetal. Old one works like a charm. So I decided to buy second one. But they are sligthly different. The old one has stiff button, hard to press. New one is very soft and mushy. But hthe problem is that the new one is constantly loosing screen. It just not turning on from time to time, until I plug it to charger without batteries. I may using it for few days wthout a problem and then suddenly it just power off screen during vaping and never turn on until I remove the batteries and plug it to charger. The new one have copied profile from old one, and both are using latest stable AF version. Any suggestios?