I purchased a 50w istick about a month ago. I have been using it with a nautilus tank and love the set up, that is until two days ago. I looked down at my istick and only half of the display screen was visible. I looked down tonight and the entire display is now dead. Two days ago when this problem first started I locked my settings so I am still able to use it. I read somewhere that unless you use a Eleaf tank the warranty is void. Has anyone else had this problem? I haven't dropped it, but it has fallen over a couple of times when I reached for it without looking. I only chose the 50W for the battery life which has been amazing.