Holy goodness (and this is two different newcomers right)
New Smok purchaser, follow Izan's advice his will not steer you wrong. It could be one of a jillion things, but to be honest, that ALSO included the possibility the mod is toast and I only INLCLUDE that because it's Smok but you should check all that other stuff first.
Also what batteries are you using, how are you charging and how old?
Newcomer #2 HOLY SMOKES what are you DOING? I sort of killed a legend but not really. I just dropped it so hard the 510 pin snapped, but it was too heavy for me anyway I am good with my solo although the Legend works fine,.
I thought I killed more mods than anyone maybe not. Maybe you wan to try the 100 watt Agis model with the 21700 battery? IDK, I dont' have one but I have found with breakage sometimes lighter is better when it comes to well drops.
Unless it's something else that is killing them? IDK tell us. LOL.
I will say I would not call any Smok mod a "tough" mod unless it was "Tough to admire in any way."
Anna