DigitalRegistrar.com warned me a month ago that my 4dsolutions.net domain name was set to expire.
But when push came to shove I forgot to reregister, resulting in this temporary outage in service.
Maybe my spam filter deflected the urgent warning (like the one I got last year around this time). Given my level of business, that wouldn't have to be my excuse.
Anyway, I've reupped for two years effective immediately. It'll take about 24 hours to repopulate the domain name servers. My apologies for the inconveniece (to me as well).