I exchanged e-mails with Carl after the Texas disaster. I too thought the worse and lack of communications brings that about.
I was trying to set up a number of bulk buys. He was refining his patterns and showing possible new offerings. E-mails started to bounce back or no reply. I was in need of a couple of items and placed a small order with 3D . No confirmation return. No response from Carl. Let some time pass and then placed the items in dispute. A couple weeks later I get a shipping notification from USPS and I removed the items from dispute.
So I am guessing communications is intermittent and unknown to Carl.
We will have to wait and see if firm consistent communications is re-established. If not, like so many others vendors we knew in the hobby we say sad goodbye, move on and substitute.