All my X2 automatics seem to be developing a very hard draw, and I'm betting it's because they're wearing out (they're all between nine months and a year old). I vape a lot, and I use them all and recharge them pretty close to daily. I recently picked up a manual and the draw seems to be MUCH easier ... is that true of manuals vs. automatics in general (that manuals draw easier), or is it a sign that my autos just need to be replaced? Do X2s lose power gradually as they wear out, or do they work fine and then just quit?