I'm having the same issue with mine. Just got a Vision Spinner 650mAh for work/driving and a VS II, and 3 Aspire BDC's (pink, blue, and silver) as well as a 5-pack of replacement coils. (The default coils on the Aspire's are 1.8ohm and the replacements are 2.1) Everything worked fine for the first fill on 2 of the clearos, and lasted a couple of days (used with my VS 650mAh). The second time I filled my pink one it started leaking insanely (same bat).
I made absolutely sure no liquid dripped into the center tube while filling and kept it upright for at least 20 minutes after re-sealing the coil to the tank. It isn't leaking from the center hole, it looked to be leaking from the edges around the yellowish rubber ring. I checked the coil and everything was fitted fine, I didn't loosen it or take it apart when I refilled my e-liquid, so I have no clue why it is all of a sudden leaking. When I took the coil out it looked like the bottom part that connects to the battery was slightly crooked, but everything is as tight as I can get it, and when I compared it to a fresh coil I saw no visible differences, no damage, no missing parts, and no cracks. So I swapped the coil out for a fresh one and set the leaking one to the side.
The next day, I pull out my blue BDC to fill with a different flavor, and this one leaks within 20 minutes (with only about 4-5 puffs the whole time, on my VS II 1600mAh). Hasn't been dropped, I was indoors in the A/C the whole time. Not sure of the PG/VG ratio of my liquids, but with the pink one I used the same liquid both times, so I do not think it is the e-liquid viscosity. I emptied it and again compared the coil, this time I did not see anything crooked, and no damage etc. So I have set that one aside for the moment until I have time to empty it and try again. I did notice with my pink one I did not tighten the tank to the battery as much, and so far no leaks today. Aside from the leaking, these tanks do give great hits, lots of vapor, and much better flavor than my long-wicked Halo Triton clearos. I only wish they did not leak, came in more colors, and had replaceable drip tips.
Edit: Mine are Aspire ET-S clearomizers