I ended up moving to a different provider instead of trying to find a decent host server at Linode. It's a shame really Linode has some really good features but it just wasn't worth spending the time trying to find a decent host machine when we could migrate once to a different provider that we know performs well.

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Paid support
How to ask for help
1. Give details of your problem
2. Post any errors
3. Post relevant logs.
4. Don't hide details i.e. your domain, it just makes things harder
5. Be polite or you'll be eaten by a grue

As of a short outage a few hours ago, I've been moved off the 2630 onto a 2670.

Neato.