Hi there i have had my subox mini now for some time and been fine up until about a month ago. The problem im getting is when i change my coil rba or factory made, it will last fine for about a day then all of a sudden it stops working. Not burnt out, when u take a drag and loose the power button u can hear it asif it pulses, after this the coil seems dead as hardly any vape is then being produced. Can anybody help!!! Thanks