The burning sensation usually means your geting dry hits inturn your coil might be gunked up depending on what kind of juice your using. Clean it out with hot water( fill half full, shake,dump out and repeat several times). Take it apart,look inside the coil and see if you have a "cocoon" of gunk on the coil. Dry your wicks off with paper towel and dry burn it. Lots of youtube and info in here about dry burning...hold the button for few seconds and release,blow the smoke and repeat bout half dozen times or when you see the coils glowing red again. If you over burn you will pop the coil and or have a permanent burn't taste. Put it all back together again, do a few good draws without power to wick the juice up, put on some power and take a few slow short draws and you notice your getting more vapor with every draw. I'm getting over a month on my CE4 and 5 wicks just by cleaning then when you notice the vapor or taste is changing