Aspire Premium Kit (CF VV and Mini Nautilus) - Killing Atomizers

I've had an Aspire Premium Kit, which uses a CF VV+ battery and Mini Nautilus tanks, for several months and it's worked great except for recently (this started happening maybe a week or so ago). I get my 50/50 or 65/35 PG/VG juice from Mount Baker Vapor and vape at 3.8-4.3 watts (battery goes from 3.3 to 4.8). The atomizers are 1.8 ohm.

Now it seems to be killing the atomizers really quickly. I went to fill the tank yesterday and when I screwed the tank back on to the battery, pressing the battery's button made it flash blue several times, which I think is some sort of "error with atomizer" thing because only replacing the atomizer seems to fix it. This doesn't make sense because I had just replaced the atomizer the day before! The previous couple atomizers only lasted about two days each.

Any idea what's going on here? There's no frickin way I'm going through an atomizer in a day, and until about a week ago an atomizer could last me a couple months (I use basically clear juice and probably don't use my e-cig as much as some people).

Here is a pic of one I had to replace after only a day:


For reference, here is a brand new one. The bad one was a little "burnt" looking but not excessively so: