Hey, for anybody else having this problem please try a new fully charged battery. I had his problem for three days, found this forum and found out that "cube" is junk, the new mod I purchased came with a new battery (with purchase) as well and I tried the new battery in my cube and it worked just fine. The vape is a piece of junk regardless because my screen only says "welcome, Bluetooth on/off, battery low" and all other times it's blank. I can't adjust the wattage or anything else. Tried everything to fix it but to no avail. Hope this helps someone else.