It looks like these message are from a problem with their Howe server. That is one of their old servers, which came over from the Textdrive merger years ago. I used to have some sites hosted on that same server, and was likewise not very happy with things. It appears to me that Joyent as a company doesn't care very much about that legacy equipment and line of business.
The way to make the pain stop, is to stop using Joyent's old TextDrive servers. You can do that by leaving Joyent entirely, or by moving to their newer stuff. Either way it's a fair amount of work, depending on the complexity of what you are hosting.
I took the path of moving to their newer stuff, and have been very happy with Joyent ever since.