Faulty Sigelei 213

My Sigelei 213 lasted two months of use before it faulted. The problem seems to be a little different every time i try and use it. Initially it was getting past the loading screen but the battery voltages were fluctuating wildly and when i would press the fire button a long row of 'HHHHHHHH' would display on the screen. It doesnt read Atomizers and now it is not displaying battery voltages at all. I have tried several batteries that are fully charged and work fine in other mods.. it appears to be a major problem with the main circuit board.