Hi I have a zenith v2 clone and a heimdall clone with a sony vtc 4 18650 battery and it has been working well for me for a few weeks. The person at the shop i purchased it at built the coils for me and it gave me no problems until recently. The coils take forever to heat up now and the battery and the bottom button both get very hot when i use it. I purchased an ohm reader and it will not read my zenith even though it will read my friends rda's fine. I have tried other ohm readers and it gives me the same result. The first step I took to fix this was rebuilding it myself. I built it about 5 times and the ohm reader still refused to pick it up and when i popped it on my mod it gave me the same results as before. The coils are starting to take longer and longer to heat and i have determined that something i have is defective. Would anyone be able to give me any advice on this? Thanks. 