I PM'ed a copy of the Aspire letter about the heads with wicks that were too small and weren't saturating properly to my local B&M vendor. She replied that she would check into it with her supplier and assured me that she would replace any that I found to be bad. Saturday, I stopped by with a bag of 5 that had failed in a day and she replaced them. I bought 3 more for a total of 8 new heads. These are all Aspire marked heads. I don't think they are knockoffs.
Last night, the head I had just installed (from my previous stock) started getting cold vapes with low vapor. I cranked the voltage from 3.3v to 3.7v and there wasn't much improvement. When I checked the resistance on my Provari, it read around 3 ohms(1.8 ohm head). After fiddling for a while, I installed one of the new heads I got at the B&M. All was good for a couple of hours and then the same thing happened. Resistance climbed steadily until a check revealed it to be at 7.2 ohms!
I installed the 3rd head in several hours and all was good again. The 3rd head started the same issue today (almost 24 hrs of use this time). When it read 2.9 phms I popped it off and installed the 4th head in about a day. It's also doing great, just like I expect my Nautilus to perform. I thought the same thing last night.
So, I decided to get out the failed heads and check them with a voltmeter just to make sure I didn't have a poor contact in my Provari. All checked within a half ohm or less from what the Provari reported. The problem is definitely in the head, not my mod.
The strange part is that the problem I'm having isn't a wicking problem as the Aspire bulletin described, it's a connection issue with the coils inside the head. I thought that maybe it was linked to a bad connection at the bottom pin so I twisted the pin back and forth and read the last coil again. It still read high ohms like before.
We definitely have a hardware issue going on with Nautilus heads. It's a shame that such a great tank fails due to poor quality control. This has to be fixed or I'm going looking again for something reliable.
I have to say that the vendor is also concerned about the problem and is standing behind the product by replacing bad heads. That's all she can do until the heads are fixed in manufacturing. Maybe the factory is slammed from production step ups to cover the bad product in the field. That's not good if we are getting thrown together products with new problems ...