I have all 3 Isticks, 20W, 30W and 50W. Two issues I am having-the 50W suddenly started auto firing so I quickly unscrewed tank and now it won't fire at all or if it does it sticks. I'm thinking there is something wrong with the firing button but wonder what to do. I love this baby and I'm very upset. The second issue is with the 30W, a lot of the time my rba's won't read, it just says "no atomizer" but rba's would work on 50W (when it was working properly). My coils are usually around .5-.7 and I vape pretty low, around 20-25W. Any ideas?? Thanks