I had that same issue with 2 of 3 iStick 50watts I purchased. They didn't start right away but about 1-2 months in, bearing in mind that i have about 8 mods going so I never use one very much per day and it will therefore take longer for me to notice something. Much came to light later about how they were self firing, which is what mine both turned into, from the same button issue I see on this 75 watt TC Sigelei mod. I doubt however, that its anywhere as bad as the iSTICK issue and it may turn out that only a very teeny weeny percentage of buyers will go on to have further problems. Had I purchased mine on sale for $59, I would still love it as I still love mine and would be happy I paid only $59 for it, but i paid double, plus 13% tax on it. I have a warranty period to consider so I am under a bit more pressure to figure out if it is going to be a problem or not and if so, deal with it under the warranty. But that is always far more hassle than it is worth so I would be very happy to find out that this lasts a year and provides great enjoyment in the meantime. But, I do feel that any later buyers should be aware of this V1, V2 and V3 issue if they are going to be buying at full price.
Same thing happened with the Heatvape Invader Mini. I purchased it for full price at a store near me. The next day noticed it was being dumped on various Chinese sale sites for $80. I started noticing a firing issue, similar to this one but much worse than this. This one may not get any worse but the Heatvape did appear that it would. I then watched a video by Busardo 2 days later and he was first to confirm that there was a V1 and V2 edition and that the V1 was kinda of crappy...LOL
I sent an email to the store i purchased it from about 2 weeks later when it died. They did not answer my email and i figured they were busy so I drove up and it became clear quickly that they had purposely not answered and did not want to deal with any return on it.
I feel if i spend $100 I am entitled to some period of time, of usage, longer than 2 weeks
I was told that they too are stuck, they don't get any returns.......( i find hard to believe if large buyers) but he at the very least gave me his, for he of course was using the V2 version, not the V1 that he had sold me but he had been heavily dripping on it for about a month plus, so i wasn't sure at the time if I was just exchanging one bad one for another but at least his worked. This V2 version does work and still has so again, had i not had it switched out I would have lost out on another $100+, "just because"
I expected a bit better from Sigelei, YiHi chip or not.
So I am still working on trying to sort out if mine needs to be looked at for warranty OR, just hope that this does not turn into a bigger issue as there will always be a small percentage of failures on any mod, on any electrical device. Its just determining if it is a small percentage or larger across the board.
Anyhow, since i do type a lot, thats all I can offer until I or someone else can come up with more....but don't take this to mean your machine if loved, isn't still as lovable, but just that the V1, V2 and V3 could explain why some are having issues and others aren't.
Id like to say that when you do pay full price, you should be receiving V2 or V3 but it remains to be seen if the stores even knew this and/or Sigelei just didnt deal with this in the most upright fashion. But WE WERE warned. There was a lot of confusion as to whether it was YiHi or not and Sigelei woudl not confirm or deny nor would the vape stores themselves and this behaviour had my alarm bells ringing
