Not sure what service you're using but you might want to look for hosting that caters to Dolphin. One that I know of is TMD Hosting, (tmdhosting.com) They are set up to work with and knowledgable about Dolphin, provide outstanding tech support and for a great price $46. (USD) a year.
I am using a white label at the moment and trying to sell my domain. I was thinking of setting up Dolphin again in hopes that it would sell once the blogs are full of spam and it looks like I am getting tons of traffic.
If I revive Dolphin for for domain I will try TMD. I had some site like dolphinhosts.com or, something like that and it was just crashing all the time. I'm on disibility so $50 per. month was just not feasible.