I bought a brand new (possibly a clone), worked for two weeks and then “No coil” errors started appearing, or more annoyingly, it would ask me whether a new coil had been connected (yes/no). It would do this every time I tried to vape and hit the fire bar. This error would come and go, and then finally, nothing would make it see the coil. In addition it would not balance charge the batteries correctly, either that or the reporting/measurement was wrong, and the tank leaks like a sieve.
No fix as yet, unfortunately.