Mishaps can happen at 15w as well as 50w when something isn't right to start with! The main problem with mechs is simply the lack of things like short circuit protection and overheat protections that will simply disable a mod. If a battery has a defect or is put in the wrong way... oops! You have a bad day!
Yet I have had a couple of regulated type batteries and mods act up as well. Mostly those simply went DOA while one was acting weird before that came about losing the ability to stay at the wattage or voltage set but suddenly drop off. Then one day they simply do nothing when the fire buttons are pressed.
Lately with different tanks in use on some of the newer mods out another thing noticed is tanks getting a bit warmer. A 100-120w model tank gets warmer at 30w then an Atlantis at 25-30w over that 5w difference? The tank design requiring the air intake be wide open would explain how the design is throwing off heat through the shell(base, top). Have yet to see any tank pop due to the ejuice it was filled with. I suspect wimpy tank designs were the major part of that problem people had been running into.
Mechs are advanced user items.
They are not for beginners.
Vapers who dont understand ohm's law and use tanks with pre built coil heads shouldn't be using mechs, as they are obviously not an advanced user.