Tonight my X2 (650 auto) is being really uncooperative. I'm using it as a passthrough and it seems to hit fine for one or two hits, then it acts like it's entirely dead. Then I put it down for a while (actually I switch to my 78) and then when I try the X2 again it hits fine once or twice, then it just acts dead. The blue charging light is on. I tried it on both a laptop usb and on the 1.5 usb wall adaptor, same either way. I also tried the usb cable from my daughter's X2, no difference. This battery is about a month old and I've been using it a lot, several hours a day. I was using it without the passthrough a lot today so no doubt the battery is run down a lot - but with the passthrough it should still vape OK while charging, shouldn't it? Surely this isn't a typical lifespan for one of these batteries. Is this happening because the battery was run down and it's charging as I vape, or is this something to contact SI about?