It's fairly new but when I try to hit it alot of times it locks itself and I'll have to unlock it to try and hit it again. Or I'll be in the middle of a hit and the coils will go back cold and then heat up again. What could be the problem and how can I fix it I'm freaking out because I thought I bought one of the best box mods I could get and now it's doing this after like 3 months of use.