The server was down for about 3 hours after a second major power outage at the new Las Vegas datacenter.
This is outside my control, but given 24 hours intentional downtime for migration to the new datacentre plus 2 subsequent power related unscheduled downtimes and 1 network route configuration downtime that was supposed to be "minutes" and became nearly 2 hours, the server has been inaccessible a lot this last month (4% downtime over the last 30 days). When the server is up, it works perfectly and speedily though.
I have spoken to the hosting company, they seem like good guys and have apologised for the downtime, but the only options I have are to stick it out and hope these type of incidents won't occur again or move to a new hosting company. Its a reasonable amount of work and hard to ensure in advance that the new company won't have similar (or worse) issues, unless we trade up to a substantially more expensive hosting company - and even then there are few guarantees and many don't take Paypal so I'd have to pay from my own credit card.
I've therefore decided to sit out another month and see what happens. If any more unscheduled downtime occurs I will get a new account with another provider and transfer the forum once more.